To find the right proposal !
Internship and thesis proposals
Criteria for selection
Number of proposals
139
1
Symmetries in non-Hermitian quantum systems: application to optimization of transport
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Fields theory/String theory
Nonequilibrium statistical physics
Quantum information theory and quantum technologies
Quantum optics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Type of internship
Théorique, numérique Description
We are looking for a motivated PhD student to join the team of quantum dynamics and control, led by Prof. Aurelia Chenu, at the University of Luxembourg. See our group: chenulab.com
We aim to characterize the impact of Hamiltonian symmetries on dynamical effects, such as the transport of excitation. The group has expertise in non-Hermitian systems, open quantum systems, and quantum chaos. The successful candidate will look at networks representing non-Hermitian systems and identify the parameters that optimize dynamical properties. The project is purely theoretical, with numerical implementation. The project is broadly defined and can be shaped to the candidate’s interest.
We ask for:
• Excellent analytical and numerical skills;
• Solid knowledge of Quantum Mechanics;
• Strong motivation and creativity.
Applications will be processed upon arrival. The position will be closed when filled.
Contact
Aurelia Chenu
23/04/2024
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Thesis :
Funding :
2
Nanostructure - electrical transport properties of HTS superconducting tapes in high magnetic fields
Domaines
Condensed matter
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
As part of a promising collaboration between Toulouse and Grenoble on the unexplored electrical properties of high critical temperature (HTS) superconducting tapes at very high magnetic fields (60 T) which depends on the physics of superconducting vortex pinning within the tapes' rich nanostructure, researchers M. Leroux from LNCMI Toulouse and A. Badel from Institut Néel Grenoble are proposing a Master 2 internship for 2024 in Toulouse. This internship could evolve into a PhD thesis project in Toulouse and Grenoble supported by the PEPR "Suprafusion" which long term aim is nuclear fusion applications (magnetic confinement, tokamak, stellarator).
Flexible start date in 2024.
The funding of the PhD position is already guaranteed and funded by the PEPR Suprafusion.
Contact
Maxime Leroux
Laboratory : LNCMI: Laboratoire National des Champs Magnétiques Intenses - UPR3228
Team : Nano
Team Website
Team : Nano
Team Website
16/02/2024
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Thesis :
Funding :
3
Ultra-cold matter waves in microgravity for atom interferometry
Domaines
Quantum gases
Metrology
Type of internship
Expérimental Description
The Laboratory Photonique Numerique Nanosciences in Bordeaux has an opening for a three-year PhD position in the field of ultracold atoms and atom interferometry (the funding is guaranteed). The starting date is October 2024. There is an online application to apply for the Ph D position on the following link:
https://recrutement.cnes.fr/fr/annonce/2700901-24-150-ultra-cold-matter-waves-in-microgravity-for-atom-interferometry-33400-talence
The deadline is March 15th.
Contact
Baptiste BATTELIER
12/02/2024
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Thesis :
Funding :
4
Phases et polarisations singulières pour l’interaction quantique laser-atome
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Non-linear optics
Type of internship
Expérimental et théorique Description
Les techniques actuelles permettent de façonner -à la carte- les lasers en intensité, en phase et en polarisation. Ainsi une phase en hélice produit un vortex optique; celui-ci transporte un moment angulaire orbital (OAM) qui est une grandeur quantique. Le vecteur optique quant à lui, est obtenu en façonnant la polarisation.
Ces singularités de phase ou de polarisation ouvrent vers de nouvelles interactions laser-matière liées au caractère quantique de l’OAM et de la polarisation, et trouvent des applications en quantique. : intrication, spectroscopie, turbulence optique, optique non linéaire, senseurs, etc.
Au LCPMR nos recherches concernent l’interaction de vortex et vecteurs optiques avec des atomes - chauds ou froids- pour créer des paires d’OAMs et les intriquer, pour observer l’évolution des vortex/vecteurs optiques en interaction résonante avec les atomes et pour réaliser des senseurs magnétiques.
Lors du stage l’étudiant se familiarisera avec les SLM (Spatial Light Modulator), créera des singularités et les caractérisera. Il pourra les appliquer à une vapeur de rubidium, placer celle-ci dans un environnement magnétique pour observer la transparence induite. Il pourra évoluer vers l’application à des atomes froids ou le couplage vecteur-vortex qui marie deux grandeurs quantiques du photon.
Le sujet ouvre sur une thèse liée aux aspects fondamentaux de ces lasers singuliers et leur utilisation.
Contact
Laurence Pruvost
04/02/2024
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Thesis :
Funding :
5
Quantum-to-classical transition seen through quantum signals: reconstruction of a classical image from a network of observers.
Domaines
Condensed matter
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Quantum information theory and quantum technologies
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Type of internship
Théorique, numérique Description
The measurement problem and the quantum-to-classical transition have gained practical significance with the advent of quantum technologies. A recent proposal to understand this transition, that goes beyond the usual decoherence paradigm, is called quantum Darwinism. Its originality is to emphasize the role of the observers themselves and their physics. Nonetheless, persistent challenges remain to be addressed and most importantly the question on how observers with finite ressources can recover a classical image. This project seeks to establish a resource-based quantum information framework to analyze this question. It aims to test these ideas through the study of measurement signals (bosonic or fermionic signals) in concrete experiements developped for quantum technologies, like those in circuit quantum electrodynamics and electron quantum optics. Additionally, the project seeks to establish a connection between these measurement signals and the N-body correlations of the quantum states, to finally answer the question of what kind of correlations are needed between N-bodies for a classical description to exit and being recovered.
Contact
Alexandre Feller
23/01/2024
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Thesis :
Funding :
6
Numerical study of the equilibrium Kauzmann transition between a liquid and a disordered glass
Domaines
Condensed matter
Statistical physics
Soft matter
Physics of liquids
Nonequilibrium statistical physics
Non-equilibrium Statistical Physics
Type of internship
Théorique, numérique Description
Most liquids gradually solidify at low temperature via a physical process called the glass transition towards a non-equilibrium disordered state of matter. This process is well-known experimentally at the macroscopic scale. At the fundamental level, however, the statistical mechanics description of the phenomenon is much less advanced, as it took several decades of difficult analytic work to `only' derive a solid mean-field transition of the liquid-glass transition. Considerable progress was also made to develop simple yet realistic atomistic models for glass transition studies, as well as numerical methods to more efficiently sample the configuration space which is known to be highly complex. Demonstrating the existence of the transition and studying the associated properties (universality, exponents, characteristic lengthscales) has not been possible so far. We wish to solve this difficult problem. In this thesis, we will develop and combine numerical approaches to systematically investigate the statistical mechanics nature of the transition between liquid and glass states in equilibrium conditions. Ultimately, this work will provide a definitive answer to a mystery that has haunted the field of disordered systems for more than fifty years by demonstrating whether a glass state of matter can truly be defined in three-dimensional glass-forming liquids.
Contact
Ludovic Berthier
23/01/2024
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Thesis :
Funding :
7
Topological properties of semiconductor heterostructures
Domaines
Condensed matter
Low dimension physics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Les phases topologiques dans les solides ont en effet attiré une attention considérable, notamment depuis l'attribution du prix Nobel en 2016 pour les concepts topologiques en physique de la matière condensée. Depuis, ces phases topologiques ont été observées dans de nombreux matériaux, mais seul un petit nombre d'entre eux dispose d'une croissance et d'un processus technologique suffisamment maîtrisés pour envisager leur utilisation possible pour les fondations d'une nouvelle électronique topologique et contribuer à l'avènement actuel des technologies quantiques. Dans ce contexte, les hétérostructures semi-conductrices III-V à base d'antimoine s'avèrent particulièrement intéressantes. L'un des phénomènes topologiques les plus frappants, appelé effet Hall quantique de spin y a en effet été observé. Notre équipe a prédit et finalement observé l'existence d'une large lacune topologique insensible à la température dans des puits quantiques spécifiques à base de Sb. Cette avancée permet d'envisager l'observation d'états électroniques de bord protégés de la rétrodiffusion par la topologie non triviale de la structure de bande, même à des températures d'azote liquide. Il s'avère que des mesures très récentes suggèrent effectivement la présence de ces états électroniques exotiques dans ces structures à des températures bien plus élevées que celle de l'hélium liquide.
Contact
Benoit Jouault
22/01/2024
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Thesis :
Funding :
8
Optimally Controlled Quantum Information Processing on Single-Molecule Magnets
Domaines
Quantum information theory and quantum technologies
Type of internship
Théorique, numérique Description
This project forms part of a collaboration with applied mathematicians, chemists and experimentalists in Karlsruhe (KIT), with the aim of realizing quantum computing applications using single molecule magnets. Specifically, we focus on the theoretical modelling of higher-dimensional qudits that arise from the nuclear spins (and the associated hyperfine interaction) of rare-earth atoms embedded in these molecules. Addressing and manipulation of individual hyperfine states can be performed using microwave electric pulses. The latter can be shaped using optimal control techniques for quantum optimization and will enable faster, more noise-robust or low-consumption logical gates. The objective of the PhD thesis is to study this issue theoretically using different optimal control techniques.
Contact
Paul-Antoine Hervieux
12/01/2024
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Thesis :
Funding :
9
Quantum sensors based on levitated nano-particles in the back-action regime : a theoretical and numerical study
Domaines
Quantum optics/Atomic physics/Laser
Nonequilibrium statistical physics
Quantum optics
Non-equilibrium Statistical Physics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Théorique, numérique Description
The purpose of this master thesis is to study (theory + numerics) the phase transition between locked and running states of a rotating nanoobject, trapped in an optical tweezer in vacuum, and submitted to the fluctuating force and torques of the trapping light field.
In this quantum back-action regime, the fluctuation of the trapping beam exert a strong action on the motion, and re-heat the particle. Using classical and quantum Langevin equations, the intern will model the (random) motion of the particle, and quantify the possibility to make a sensor for tiny forces and / or torques.
The internship is paid, is purely theoretical and numerical but will be done in close connection with our experimental team. A pH-D might be proposed at the end.
Contact
Mathias PERRIN
22/12/2023
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Thesis :
Funding :
10
Quantum nanophotonics
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Quantum information theory and quantum technologies
Quantum optics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
The Group of Theory of Nanophotonics of San Sebastián and the Nanophotonics group of Bordeaux offer a PhD position in cotutelle starting in 2024 to work on theoretical and experimental aspects of quantum nanophotonics. The student will work on the optimization of light emission from coherently coupled organic molecules in controlled nano-environments for molecular characterization and quantum information technologies. Collective phenomena such as superradiance and subradiance induced by collective excitation of the emitters will be studied, especially by analysing the correlations of the light emitted by these systems. The candidate is expected to focus on the theoretical description of cutting-edge experiments under way in the laboratory of Bordeaux, with the aim of developing applications in quantum state engineering. More information can be found in https://www.euskampus.eus/es/actualidad/oferta-empleo-investigadora-doctorado-co-tutela-nanophotonics
Contact
Esteban Ruben
20/12/2023
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Thesis :
Funding :
11
Superconductivity and topological states in twisted bilayer graphene
Domaines
Condensed matter
Low dimension physics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
The first measurements of superconductivity and correlated phases in twisted bilayer graphene (tBLG) brought a lot of attention to this new way to control the properties of matter: twisting layers in a van der Waals (vdW) heterostructure. The superconducting state in tBLG or twisted van der Waals structures is believed to have its origin in the interplay between the moiré superlattice and the interlayer interactions, which leads to the formation of a flat band in the electronic band structure. Controlling the twist angle between the layers allows playing with both of these parameters at the same time. As layers get more aligned, the moiré superlattice wavelength and the layer hybridization increases. However, as the two layers get more and more aligned, at angles >1.1°, the superconducting temperature decreases. The most challenging part of this research seems to lay in a reliable fabrication of homogeneous samples. In our laboratory we have developed a new technique to continiously control the angular alignment between layers [Science 361, 690].
In this experimental internship, we propose to use a new technique to control the angular alignment between layers in a vdW heterostructure combined with low temperature measurements of electron transport to reveal the phase diagram of the superconducting state and other strongly correlated effect.
Contact
Rebeca Ribeiro
10/12/2023
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Thesis :
Funding :
12
Tunnel magnetoresistance at room temperature in scalable epitaxial van der Waals magnet heterostructures
Domaines
Condensed matter
Low dimension physics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
The emergence of two-dimensional (2D) materials and their van der Waals (vdW) heterostructures offer unprecedented electronic properties for next-generation technologies. 2D magnets have the potential to revolutionise magnetic sensors and spintronic technologies, particularly tunnel magnetoresistance (TMR) devices. These devices offer ultra-high sensitivity in magnetic field detection at room temperature, making them invaluable for applications such as magnetic sensors, data storage, memory, and computing. However, reliable and tunable TMR devices pose challenges with conventional materials. Recent advancements have achieved large TMR values using 2D magnets, however most of the reports are limited to cryogenic temperatures and studies are limited to exfoliated flakes. Scalable growth of 2D magnets and the fabrication of magnetic tunnel junctions (MTJs) with multiple layers separated by a tunnel barrier remain challenging and coherent spin- polarised electron tunneling across vdW tunnel barriers on TMR effects is also unexplored. We propose to address these challenges by controlling spin-polarised tunneling in 2D MTJs through twist angle achieving large and tunable TMR at room temperature.
In this experimental internship, we propose to use a new technique to control the angular alignment between layers in a vdW heterostructure combined with low temperature measurements of electron transport to reveal the phase diagram of the TMR.
Contact
Rebeca Ribeiro
10/12/2023
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Thesis :
Funding :
13
Magneto-ionic control of chiral magnetic structures for neuromorphic computing
Domaines
Condensed matter
Low dimension physics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Magneto-ionics is an emerging field that offers great potential for reducing power consumption in spintronics memory applications. By combining the concept of voltage controlled ionic motion from memristor technologies, typically used in neuromorphic applications, with spintronics, it provides a unique opportunity to create a new generation of neuromorphic functionalities based on spintronics devices. Our group has been at the forefront of investigating the magneto ionic control of magnetic anisotropy, magnetic domain wall motion, and the Dzyaloshinskii Moriya interaction in various materials. We have demonstrated large, reversible, and non volatile effects in magnetic properties due to the chemical interaction between the mobile ions and the magnetic atoms.
We are seeking a motivated candidate to join our team and work on an experimental research project focused on designing artificial synaptic functionalities through magneto ionic control of chiral magnetic structures This includes the gate control of nucleation/annihilation of skyrmionic spin structures, which will be used as a means to update synaptic weights in spintronics artificial synapses. The ultimate goal of the project will be to integrate the magneto-ionic synapses into artificial neural networks. The project will greatly benefit from our team's collective expertise in both magneto-ionics and neuromorphic computing architectures.
Contact
Liza Herrera Diez
05/12/2023
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Thesis :
Funding :
14
Topological superconductivity : towards quantum computation with complex oxide two-dimensional electron gases
Domaines
Condensed matter
Low dimension physics
Quantum information theory and quantum technologies
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
The recent discovery of new oxide 2DEGs based on KTaO3 (e.g. LaAlO3/KTaO3) pave the way towards the observation of Majorana Zero Energy Modes (MZMs) in quantum oxide matter. The project aims at fabricating and studying field-effect mesoscopic nanodevices in KTaO3 oxide interfaces, in which superconductivity and spin-orbit coupling could be tuned at the relevant scales using a set of nano-gates. We will start by investigating the superconducting phase of the 2DEGs by combining various experimental techniques. This includes low temperature electronic transport, microwave conductivity, and tunnelling spectroscopy. Our primary objectives are to ascertain the nature of the superconducting state—distinguishing between single-gap and multigap scenarios—and to elucidate the symmetry of the order parameter(s). This foundational knowledge will serve as the basis to understand the origin of superconductivity in KTO 2DEGs, and the interplay between Rashba spin-orbit coupling and superconductivity in the context of topological superconducting phases.
Simultaneously, we will embark on the creation and analysis of Josephson junctions and SQUID devices, in which we will look for signatures of topological superconductivity. Our ultimate objective involves the fabrication of topological 1D nanowires, wherein we will search for robust signatures of Majorana zero modes (MZMs). This quest will be pursued through tunneling spectroscopy of edge states and microwave experiments.
Contact
Nicolas Bergeal
03/12/2023
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Thesis :
Funding :
15
Study of spin squeezing generated with an optical cavity integrated on an atom chip
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Quantum gases
Metrology
Type of internship
Expérimental et théorique Description
This internship proposal concerns a second generation of experiments evaluating the contribution of non-classical, entangled states to improve the stability of atomic clocks. Spin squeezed states redistribute the fundamental quantum noise of the atomic phase to a conjugate variable of secondary interest. This overcomes the fundamental signal-to-noise limit of today's best clocks. The principle of improvement has been demonstrated by several teams around the world, but no device has yet reached the performance level of a real clock. Our aim is to improve, for the first time, a state-of-the-art atomic clock.
Contact
Carlos Garrido Alzar
24/11/2023
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Thesis :
Funding :
16
Infrared electroluminescence using nanocrystals
Domaines
Condensed matter
Low dimension physics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Nanocrystals are semiconductor nanoparticles with tunable optical features from UV to THz. They have become key building blocks of optoelectronics with their integration as light sources in displays. The INSP team is working on narrow bandgap nanocrystals and their applications for infrared optoelectronics.
In this project, we work with HgTe nanocrystals presenting light emission in the 1-5 µm range. The goal of the project is to design/fabricate and characterize light-emitting diodes from these nanocrystals. We have obtained some promising preliminary results and now aim to push toward a longer wavelength. Current performances remain modest and LED design will benefit from new strategies. Here we target to develop strategies where multiple photons can be obtained per injected charge. A second aspect of the project will deal with light extraction and require integration at the LED level of some light management strategies based on nanoantenna.
The internship and the PhD thesis that will follow will be performed jointly at INSP for the fabrication and characterisation of the diodes, and at LPENS for the study of light management strategies and the characterisation of the corresponding structures.
Contact
Angela Vasanelli
24/11/2023
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Thesis :
Funding :
17
Quantum engineering of nanofluidic transport
Domaines
Condensed matter
Physics of liquids
Low dimension physics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
This thesis focuses on the experimental study of the interplay between nanofluidic transport and electronic excitations at the interface between flowing liquids and semiconducting systems. The aim is to explore interfacial coupling processes between fluids and solids. This coupling arises from the coherent energy exchange between the collective modes of the fluid (which we coin ‘hydrons’) and the electronic and lattice excitations – plasmons and phonons – in the confining semiconductors. The coupling between fluids and solids, already validated by experimental and theoretical results in nanofluidics, is opening a new area of investigation at the interface with semiconductor quantum devices that merges today at the same length scale. These nanoscale devices where quantum confinement is an unavoidable ingredient to determine physical properties is the playground where we are going to develop the thesis proposal.
Contact
Angela Vasanelli
24/11/2023
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Thesis :
Funding :
18
Circular Rydberg atom of Strontium in optical tweezers
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Type of internship
Expérimental Description
The purpose of the proposed PhD work is to build a new experimental set-up to prepare arrays of circular state atoms of strontium in a cryogenic environment. This requires trapping ground state strontium atom in optical tweezers, transferring them into the circular state, and capturing the circular state again using a tweezers tune close to the optical transition of the ionic core. Then, we will demonstrate that it is possible to measure the state of the Rydberg atom by using the selective fluorescence of the second valence electron.
During master internship, the student will set up the laser system to cool and trap ground state strontium atom in optical tweezers.
Contact
Sébastien Gleyzes
24/11/2023
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Thesis :
Funding :
19
Quantum engineering of light with intracavity Rydberg superatoms
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Quantum optics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Non-linear optics
Quantum gases
Type of internship
Expérimental et théorique Description
Optical photons are excellent carriers of quantum information, but their lack of mutual interactions is a major roadblock for quantum technologies. Our new setup enables such interactions by transiently injecting the photons into an intra-cavity cold atomic gas and converting them into strongly interacting Rydberg polaritons. The Rydberg-blockaded cloud then acts as an effective two-level superatom with an enhanced coupling to light. We can coherently manipulate its state, efficiently detect it, and observe state-dependent pi phase flips on the light reflected from the cavity as required for many quantum engineering tasks. Recently, we fully deterministically generated free-propagating states of light with negative Wigner functions. We are now expanding the capabilities of this platform towards the multi-superatom / multi-mode regime. A possible experimental M2 internship will consist in demonstrating a cavity-mediated entanglement between two superatoms, leading to a PhD project focused on deterministic multi-photon quantum logic and Wigner-negative light states generation. Another internship topic, more oriented towards theory and experimental design, will be to study the possibility to trap and control a single atom next to a superatom. The following experimental PhD thesis will aim at developing quantum interconnects between static and flying qubits, in a collaboration with the quantum tech company Pasqal.
Contact
Alexei Ourjoumtsev
17/11/2023
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Thesis :
Funding :
20
Magic angle in graphene
Domaines
Condensed matter
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
Condensed matter physicists used to associate new exotic properties to new materials development. In 2018 a paradigm shift happened with the observation of superconductivity in two layers of graphene with a relative crystallographic rotation of ~ 1.1 degrees, the so-called magic angle twisted bilayer graphene (MATBG). This unprecedented new knob to change properties of 2D materials is already showing a plethora of unexplored properties and leading to a universe of new technological applications in the new and fast growing field of twistronics (Twistronics: control of the electronic properties of 2D materials in a van der Waals heterostructure by changing their relative crystallographic alignment)
The unexpected behavior in MATBG is due to the existence of flat bands in its electronic band structure. These flat bands are the product of the interplay of interlayer tunneling and angle-induced momentum mismatch, which guarantees a large density of states and therefore an amplification of the effects of interactions. This causes correlated states which manifest experimentally by the emergence of new ground states such as superconductivity (SC), Mott insulators and quantum anomalous Hall effect (QAHE). In this internship, the student will fabricate such a device and perform electronic transport measurements (current and shot noise) to reveal its fundamental properties.
Contact
Preden Roulleau
17/11/2023
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Thesis :
Funding :
21
Electrical excitation of a 2D semiconductor in a plasmonic nanocavity
Domaines
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
In this project the goal is to locally and electrically excite chiral plasmonic nanocavities in order to enhance the chiral properties of a new class of two-dimensional (2D) semiconductors called transition metal dichalcogenides (TMDCs). These materials are key for a new branch of physics and technology called valleytronics.
During this internship/thesis, the student will acquire experience in (i) scanning tunneling microscopy and atomic force microscopy (imaging of the chiral structures and excitation), (ii) optical microscopy (detection and analysis of the emitted light) and (iii) the theory of plasmonics and two-dimensional semiconductors (“valleytronics”). The successful applicant will have a physics background or equivalent, and will have an affinity for optics and nanoscience and a desire to do experiments. Good communication skills in English OR French are required. Note that for a motivated candidate, the project may also include numerical modeling.
Please contact us for further information!
Contact
Elizabeth Boer-Duchemin
16/11/2023
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Thesis :
Funding :
22
Local electrical excitation of a chiral nanoparticle
Domaines
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
The chiral properties of light and matter will be explored in this project using the tunneling current from a scanning tunneling microscope. In particular, we will use the tunneling-electron excitation of a chiral plasmonic nanoparticle in order to produce an electrical nanoscale source of circularly polarized light.
If you are attracted to the nanosciences and optics, are interested in the interactions of light with matter, and want to use a tangible instrument which exploits quantum mechanics, please contact us for further information!
Contact
Elizabeth Boer-Duchemin
16/11/2023
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Thesis :
Funding :
23
Analog time reversal processor for radiofrequency signals
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Type of internship
Expérimental Description
Time reversal is a technique based on the invariance of the wave propagation equation in an inhomogeneous medium. It ensures spatial and temporal refocusing of a wave after having recorded the transmission channel signature. When the propagation medium is non-stationary, the transmission channel characteristics keep changing. The time-reversed signal must be sent as quickly as possible, otherwise the refocusing will not be effective. In the first demonstrations of time-reversal with RF waves, analog-to-digital converters (ADC) were used, limiting the processing bandwidth. In the aim of reaching the GHz regime, the latency time becomes problematic because of the limited sampling rate of ADCs. Conversely, a fully analog solution has the advantage of avoiding this conversion step.
At Institut Langevin, we design original analog architectures for processing optically-carried radiofrequency signals based on light-matter interaction in rare-earth ion-doped crystals. In particular we recently proposed an architecture able to generate controlled, time-reversed copies of arbitrary waveforms. The goal of the internship will be to advance the development of this time-reversal processor, first using arbitrary signals and then using real RF signals reverberated in a cavity.
Contact
Anne Louchet-Chauvet
Laboratory : Institut Langevin - UMR7587
Team : IL: NCIS (New Concepts for Imaging and Sensing)
Team Website
Team : IL: NCIS (New Concepts for Imaging and Sensing)
Team Website
15/11/2023
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Thesis :
Funding :
24
Inertial sensing based on optomechanical coupling in rare-earth-doped crystals
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Quantum information theory and quantum technologies
Metrology
Type of internship
Expérimental Description
The realization of a cryogenic, broadband, high-sensitivity accelerometer is a major challenge in many physics domains, from quantum technologies to seismology and gravitational wave detection. In rare-earth ion-doped crystals, well known for their very narrow optical transitions at low temperatures, and increasingly used in quantum technologies, the energy levels are coupled to the mechanical stress of the host matrix via the crystal field around the ion.
We have recently demonstrated that this coupling can be exploited to provide a continuous optical measurement of the mechanical vibrations of a cryostat, with an already promising sensitivity and bandwidth. This measurement is based on the continuous interrogation of the optical transition with a monochromatic laser.
The internship will consist in pushing the development of this sensor to achieve an ultra-sensitive, unidirectional and calibrated accelerometer.
Contact
Anne Louchet-Chauvet
Laboratory : Institut Langevin - UMR7587
Team : IL: NCIS (New Concepts for Imaging and Sensing)
Team Website
Team : IL: NCIS (New Concepts for Imaging and Sensing)
Team Website
15/11/2023
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Thesis :
Funding :
25
Quantum optics in lattices of microcavities
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Quantum information theory and quantum technologies
Quantum optics
Non-linear optics
Quantum gases
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
When shining classical light onto a non-linear medium, intriguing quantum states of light can be generated such as squeezed states, single photon states or complex multiphoton entangled states. In the past years, theoretical physicists have proposed to use lattices of highly non-linear resonators to engineer spatial and temporal entanglement between photons. To date, a versatile and scalable experimental platform is still missing in the optical domain, where a great variety of applications are foreseen for quantum science and quantum technology.
Our group at C2N has developed a unique expertise in designing photonic lattices of coupled non-linear semiconductor microcavities. We show, in Fig. 1, some examples of assemblies of coupled microcavities where light emulates the properties of electrons in a benzene molecule or in graphene
The challenge we propose to tackle in this Internship and PhD work is to engineer interactions between photons that are strong enough (at the single photon level) to enter the quantum regime. To do so, we will optimize the non-linear medium and produce a new generation of non-linear semiconductor lattices using the state-of-the art nanotechnology tools that are available in the C2N clean room.
Contact
Sylvain Ravets
13/11/2023
/
Thesis :
Funding :
26
Superfluid quantum gases in bubble traps
Domaines
Quantum optics/Atomic physics/Laser
Low dimension physics
Quantum information theory and quantum technologies
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Hydrodynamics/Turbulence/Fluid mechanics
Quantum gases
Type of internship
Expérimental et théorique Description
This project is devoted to the study of the nonequilibrium dynamics of a superfluid trapped onto the surface of a bubble. One of the goals will be to create a second bubble concentric to the existant one, and transfer two rubidium Bose-Einstein condensates in each one. The subsequent studies will be part of an already ANR funded PhD, where one will rotate the quantum gas to create quantized vortices and study turbulence and more generally non-equilibrium dynamics in this curved two-dimensional space. The tunnel coupling between the two rotating superfluids will be also demonstrated and studied.
Contact
Laurent Longchambon
13/11/2023
/
Thesis :
Funding :
27
Interaction lumière-matière dans un capteur quantique destiné à l’imagerie du cerveau
Domaines
Quantum optics/Atomic physics/Laser
Type of internship
Expérimental et théorique Description
Mag4Health concoit un nouvel imageur du cerveau qui permet de visualiser non pas les tissus, mais les courants électriques qui circulent entre neurones. Ceci permet d'affiner le diagnostic de maladies telles que l’épilepsie, le trauma crânien ou l’Alzheimer.
Cet imageur est constitué d’une matrice de capteurs quantiques, basés sur des atomes d’hélium à l'état métastable, dont le spin collectif est préparé par pompage optique avec un laser. Il est alors possible de réaliser une mesure vectorielle du champ magnétique avec une résolution record.
Ce stage vise à préparer une 2ème génération de capteurs encore plus performants. Le stagiaire commencera par concevoir et réaliser des bancs optiques basés sur des lasers : le premier servira à caractériser l’élément sensible par des techniques de spectroscopie en absorption saturée, le deuxième à mesurer les différentes contributions de bruit provenant de l’interaction entre les atomes métastables et la lumière (bruit de spin, bruit de photons en amplitude et polarisation, bruits techniques…) Avec ces bancs le stagiaire explorera différents régimes, de manière à mieux comprendre leur physique, et identifier des gains de performances. Cette démarche sera encadrée par deux membres de l’équipe avec un background de physique atomique. Les résultats pourront faire l’objet de brevets et publications.
Contact
Agustin Palacios-Laloy
13/11/2023
/
Thesis :
Funding :
28
Antibunching effect and squeezed light in a cold atom ensemble
Domaines
Quantum optics/Atomic physics/Laser
Quantum optics
Non-linear optics
Type of internship
Expérimental Description
Cold atoms coupled to photons are a promising platform for quantum information,
computation and communication. The light radiated by a quantum emitter, such as an atom, generally features quantum correlations and squeezing , which are at the heart of many applications in quantum technologies. While antibunching is the key ingredient for single photon sources, squeezed light is an important tool for sub shot noise quantum sensing.
The goal on our experiment is to detect antibunching and squeezed light with many quantum emitters in a 3D system . This will be implemented and studied on our cold atom experiment, taking advantage of our experience with generating clouds of cold atoms with large optical thickness, a prerequisite for this project. The current collaboration with the group of Arno Rauschenbeutel will finally help to determine the experimental parameters needed to observe this antibunching effect.
Contact
Mathilde Hugbart
10/11/2023
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Thesis :
Funding :
29
Etude théorique et numérique de la transition quantique classique par une approche utilisant les marches aléatoires branchantes.
Domaines
Statistical physics
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Non-equilibrium Statistical Physics
Kinetic theory ; Diffusion ; Long-range interacting systems
Nuclear physics and Nuclear astrophysics
Type of internship
Théorique, numérique Description
Ce stage se propose d'explorer le lien entre l'équation de Schrödinger et la mécanique statistique des processus critiques, d'un point de vue théorique et numérique. Les développements formels -qui peuvent être vus comme l'étude de la quantification stochastique de Nelson dans le secteur non relativiste- s'appuieront sur des travaux relativement récents de Nagasawa et seront interprétés à la lumière de la théorie de l'onde pilote de Bohm. Les aspects numériques seront réalisés par une extension d'algorithmes de type "Diffusion Monte Carlo" du régime stationnaire au régime transitoire. On cherchera en particulier à reproduire numériquement le phénomène de "quantum carpet" avec ces outils, ainsi que la transition quantique/classique.
Contact
Eric Dumonteil
10/11/2023
/
Thesis :
Funding :
30
Quantum computing with driven dissipative superconducting circuits
Domaines
Condensed matter
Quantum Machines
Quantum information theory and quantum technologies
Type of internship
Expérimental Description
This internship, that is a first step towards a PhD in collaboration with Alice&Bob, is on the topic of experimental quantum computing with superconducting circuits. Our team builds quantum bit (qubits) that are intrinsically protected against certain types of errors. The goal of this internship is to implement a two-qubit gate between two protected superconducting qubits. The outstanding challenge is that this gate must not break the built-in protection. If this challenge is met, we will have demonstrated all the building blocks to implement a fully protected logical qubit. The candidate will work on qubit design, mounting chips in a cryogenic setup and data acquisition and analysis.
Contact
Zaki Leghtas
10/11/2023
/
Thesis :
Funding :
31
Anderson localization of light in three dimensions with cold atoms
Domaines
Quantum optics/Atomic physics/Laser
Quantum optics
Quantum gases
Type of internship
Expérimental Description
After the prediction by Anderson of a disorder-induced conductor to insulator transition for electrons, light has been proposed as ideal non interacting waves to explore coherent transport properties in the absence of interactions. Previous studies on Anderson localization of light using semiconductor powders or dielectric particles have shown that intrinsic material properties, such as absorption or inelastic scattering of light, need to be taken into account in the interpretation of experimental signatures of Anderson localization. Laser-cooled clouds of atoms avoid the problems of samples used so far to study Anderson localization of light. Ab initio theoretical models have shown that a high spatial density of the scattering sample might allow to observe Anderson localization of photons in three dimensions. An alternative proposal suggests to use additional diagonal disorder, which can be realised via a speckle field. In this project, we propose to study experimentally these routes towards Anderson localization of light in three dimensions.
Contact
Robin Kaiser
10/11/2023
/
Thesis :
Funding :
32
Waveguide-QED - combining cold atoms and nanophotonics
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Quantum optics
Type of internship
Expérimental et théorique Description
Controlling light-matter interaction at the single-quantum level is a long-standing goal in optical physics, with applications to quantum optics and quantum information science. However, single photons usually do not interact with each other and the interaction needs to be mediated by an atomic system. Enhancing this coupling has been the driving force for a large community over the past two decades.
In contrast to the cavity-QED approach where the interaction is enhanced by a cavity around the atoms, strong transverse confinement in single-pass nanoscale waveguides recently triggered various investigations for coupling guided light and cold atoms. Specifically, a subwavelength waveguide can provide a large evanescent field that can interact with atoms trapped in the vicinity. An atom close to the surface can absorb a fraction of the guided light as the effective mode area is comparable with the atom cross-section. This emerging field known as waveguide-QED promises unique applications to quantum networks, quantum non-linear optics and quantum simulation. Recently, the LKB team pushed the field for the first time into the quantum regime by creating an entangled state of an array of atoms coupled to such a waveguide. Two experiments are dedicated to this waveguide-QED effort and internships/PhD projects are proposed on both of them.
Contact
Alban Urvoy
10/11/2023
/
Thesis :
Funding :
33
Hybrid and non-Gaussian optical quantum state engineering
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Quantum optics
Non-linear optics
Type of internship
Expérimental et théorique Description
The use of light in quantum information processing and networks has historically been split between two communities. On one side is the continuous-variable (CV) approach, which treats optical fields as waves. On the other side is the discrete-variable (DV) approach, harnessing the properties of individual photons. By considering a hybrid approach bridging the two, one could envision quantum architectures where the two encodings can be for instance interchanged fittingly to the task at hand.
In this hybrid quantum optics context, the LKB team demonstrated the first engineering of hybrid entanglement of light, i.e. entanglement between particle- and wave-like optical qubits. This novel resource enabled then to demonstrate the remote state preparation of cat-state qubits and recently the teleportation between different encodings, realizing thereby a first quantum-bit encoding converter.
The research of the group is now focusing into two directions. The first one aims at harnessing further the unique benefits of the hybrid optical approach for quantum connections, to develop optical quantum connections versatile enough to connect different physical quantum platforms and faithfully carry a broad range of quantum states. The second direction builds on the high-fidelity non-gaussian resources available on the experimental setup and aims at the realization of complex optical non-gaussian states that can find applications in bosonic error correcting codes.
Contact
Alban Urvoy
10/11/2023
/
Thesis :
Funding :
34
Quantum-repeater architecture with high-performance optical memories
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Quantum optics
Type of internship
Expérimental et théorique Description
Central to the development of long-distance quantum communications is the concept of quantum repeater. It consists in dividing a long communication channel into various shorter segments over which entanglement can be faithfully distributed. Adjacent segments are then connected by entanglement swapping operations. To be scalable, this approach requires quantum memories, which enable quantum states to be stored at each intermediate node.
In this context, the LKB team developed a large cold atomic ensemble based on an elongated magneto-optical trap (3-cm long), enabling 90% efficiency for entanglement storage between two memories. This is the state-of-the-art in term of storage-and-retrieval efficiency for a quantum memory, regardless of the physical platform considered.
The work is now focusing on two directions. A first one is to improve other figures of merit, including storage lifetime and multimode capacity. A second one is the demonstration of a 50-km telecom quantum repeater link relying on two distant quantum memories and frequency non-degenerate photon pair sources.
Contact
Alban Urvoy
10/11/2023
/
Thesis :
Funding :
35
Local THz photons for coherent light-matter interaction
Domaines
Condensed matter
Low dimension physics
Nouveaux états électroniques de la matière corrélée
Quantum information theory and quantum technologies
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
This internship is focused on the realization of a frequency converter utilizing the inherent non-linearities of thin film superconductors. In the long term, this on-chip frequency converter will allow the development of a platform for THz spectroscopy at the mesoscopic scale. The goal of the thesis will be to study collective excitations such as magnons in graphene or vibrational modes in proteins.
Contact
Alexis Jouan
09/11/2023
/
Thesis :
Funding :
36
Elucidating strongly correlated materials with noisy quantum computers
Domaines
Condensed matter
Statistical physics
Nouveaux états électroniques de la matière corrélée
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Nonequilibrium statistical physics
Quantum information theory and quantum technologies
Non-equilibrium Statistical Physics
Type of internship
Théorique, numérique Description
Strongly correlated materials are, by definition, materials for which easy classical computational approaches, such as mean-field theory, break down: they are typically unable to explain the exotic quantum phases that these materials display. To explain those phenomena, exponentially costly algorithms (Lanczos method, Monte-Carlo approaches, tensor-network methods) have been developed over the years, but still fail to reach physically interesting regimes due to their cost.
Quantum computers have been proposed to circumvent this exponential hurdle: thanks to their quantum properties, they provide, at least on paper, fast (polynomial) algorithms to tackle strongly correlated materials. In reality, however, the levels of noise inherent to current and near-term quantum processors severely challenge the promises of quantum computing.
The goal of this internship is to develop algorithmic methods to extend the reach of classical algorithms thanks to quantum algorithms. The approach will be to identify the most promising candidates on both classical and quantum sides and devise hybrid methods that play on their respective strengths. A typical first direction will be the use of (classical) embedding methods such as dynamical mean field theory and solve it using quantum algorithms possibly supplemented with classical algorithms, such as tensor networks or Monte-Carlo algorithms.
Contact
Michel Ferrero
09/11/2023
/
Thesis :
Funding :
37
Ultracold Fermi liquids
Domaines
Condensed matter
Quantum gases
Type of internship
Théorique, numérique Description
Le projet de ce stage théorique est d'étudier le comportement des gaz quantiques fermioniques hors d'équilibre. Cette thématique de recherche qui remonte aux débuts de la physique quantique à N corps a pris une importance nouvelle grâce au dynamisme des expériences d'atomes froids. Les nouvelles technologies de piégeage par laser, notamment les boîtes à atomes, permettent d'obtenir des gaz de fermions extrêmement propres et malléables, qui peuvent ainsi mettre à l'épreuve notre compréhension fondamentale de la matière quantique.
Dans sa phase normale, et en régime d'interaction modéré, le système peut se décrire comme un gaz dilué de quasiparticules: un liquide de Fermi. L'objectif du stage sera de calculer les paramètres de ce liquide de Fermi (la relation de dispersion et la fonction d'interaction des quasiparticules) au second ordre en la force des interactions. On résoudra ensuite l'équation de transport de manière exacte pour en déduire la forme des modes collectifs (ondes sonores ou ondes de polarisation dans le cas d'un mélange inégal de spin up et down). L'analyse des résultats théoriques se fera en lien étroit avec les mesures expérimentales (notamment du groupe de Yale), et on se demandera quelles déviations au régime liquide de Fermi les expériences sont susceptibles d'observer.
Contact
Hadrien Kurkjian
08/11/2023
/
Thesis :
Funding :
38
A non-quantum computer based on a coherent Ising machine
Domaines
Condensed matter
Statistical physics
Physics of liquids
Quantum Machines
Nonequilibrium statistical physics
Quantum optics
Non-equilibrium Statistical Physics
Hydrodynamics/Turbulence/Fluid mechanics
Type of internship
Expérimental et théorique Description
Quantum computing, and quantum-inspired computing, could be the new frontier in answering complex optimization problems that are historically unsolvable on classical computers. Today’s fastest computers may take millennia to conduct highly complex calculations (NP-hard problems), including combinatorial optimization problems involving many variables. The Coherent Ising Machine (CIM) is the most promising solution to date.
The aim of this project is to implement a CIM with water waves and controllable electrostriction. Using little modulated electric rod above the surface it is possible to create “spins” with arbitrary phase and positions. This project is experimental and aim to build this wave computer. It is possible to pursue with a funded thesis.
Contact
Emmanuel Fort
08/11/2023
/
Thesis :
Funding :
39
Generating light with phonons in 2D materials
Domaines
Condensed matter
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Phonons are the quanta of vibrations in a crystalline lattice. When a solid-state system is subjected to an external excitation, its relaxation to thermodynamic equilibrium generates phonons, which propagate and encounter scattering events at the origin of heat diffusion. The phonon relaxation dynamics is thus mostly non-radiative, and phonons are usually considered only as a dissipative reservoir. This project deals with the demonstration of light generation by phonons.
Contact
Guillaume CASSABOIS
08/11/2023
/
Thesis :
Funding :
40
Far field energy distribution control using a coherent beam combining femtosecond digital laser
Domaines
Quantum optics/Atomic physics/Laser
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Quantum optics
Non-linear optics
Type of internship
Expérimental et théorique Description
Coherent Beam Combining (CBC) of fiber lasers is a promising technique to scale-up peak and average powers of laser systems with beam shaping capabilities. XCAN is a CBC fs fiber digital laser based on 61 tiled channels stacked in a hexagonal arrangement and operating in both high peak & average power regimes. Tiled aperture offers high agility in terms of far field beam shaping as each channel is seen as an individual pixel where amplitude & phase are controlled independently. However, the periodic intensity distribution of the array beams in the near field gives rise to low-intensities side-lobes. Thus, the combined beam corresponds only to the main lobe of the far field pattern. The combining efficiency is defined as the power in this central lobe over the average power in the far field.
The aim of this internship is to explore different phase, intensity and polarization patterns as a tool for far field shaping on demand and to further improve the efficiency achievable with tiled aperture CBC. The candidate shall investigate patterns capable of re-steering the maximum of energy into the main lobe. He/she will develop codes for CBC numerical simulation. Iterative computing approaches like the Gerchberg-Saxton algorithm, deep learning, neural network and genetic algorithms allow computing the required phase and intensity modulation to be applied on the near field to produce a predefined target far field distribution. Experimental demonstration on XCAN shall be performed.
Contact
Jean-christophe Chanteloup
07/11/2023
/
Thesis :
Funding :
41
Strongly interacting clouds of few ultracold atoms
Domaines
Quantum optics/Atomic physics/Laser
Low dimension physics
Quantum gases
Type of internship
Expérimental et théorique Description
In this intership, we will explore the physics of rotating clouds of few ultracold atoms with the perspective of realizing topological strongly-interacting quantum phases of matter
Contact
Jérôme Beugnon
06/11/2023
/
Thesis :
Funding :
42
Quantum many-body effects in the design of materials for photovoltaics.
Domaines
Condensed matter
Type of internship
Théorique, numérique Description
The behavior of charge excitations in materials is a key process for optoelectronics technology, that raises numerous fundamental questions. In the field of photovoltaics (PV), semiconductor models based on the independent-particle picture can give precious insight but depend on adjustable parameters and are tailored to specific classes of materials. This limits their capability to make reliable predictions and to profit from the opportunities offered by many-body phenomena to achieve a breakthrough in the improvement of device efficiency. Electron-hole coupling, hot electrons coupled to phonons, and multiple exciton generation, are all challenging effects of the electronic interactions that can be turned into novel pathways for improved solar cells. Studying these effects will be at the core of an internship, which will be carried out in the theoretical spectroscopy group at LSI. For more information please visit: https://etsf.polytechnique.fr/. The project will be in collaboration with Matteo Gatti and Lucia Reining.
Contact
Vitaly Gorelov
06/11/2023
/
Thesis :
Funding :
43
Nanoparticle synthesis by nanosecond repetitively pulsed plasma discharges
Domaines
Non-linear optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Metrology
Type of internship
Expérimental Description
The portable, on-demand, and point-of-use (POP) synthesis of nanoparticles (NP) can improve the feasibility of mobile applications requiring such materials. For exam-ple, research in nanoenergetic materials includes using NP in liquid fuels to reduce pol-lutant emissions such as CO2. For electric propulsion in space, NP have been explored as alternative propellants. Conventional techniques for NP synthesis generally operate at local thermodynamic equilibrium (LTE) and are not appropriate for POP NP synthesis. However, fast, efficient, finely-controlled synthesis using a simple and compact platform may be possible with nanosecond repetitively pulsed (NRP) discharges that initiate non-LTE chemistry to promote nucleation and growth. This project will seek to demonstrate the efficacy NRP discharges for NP synthesis and develop a detailed, quantitative understanding of the synthesis mechanism. These goals will be achieved by linking the properties of the plasma, the products, and the reactive medium through tightly coordinated experiments centered on in situ laser diagnostics of spatio-temporal NP growth by using spontaneous Raman spectroscopy and coherent anti-Stokes Raman spectroscopy, as well as optical emission spectroscopy to determine plasma properties. Finally, we will develop a detailed, quantitative model of NP growth, which may involve molecular dynamics simulations or theoretical modeling.
Contact
David Pai
06/11/2023
/
Thesis :
Funding :
44
Qudit hyper-clock with SU(2) dynamic symmetry
Domaines
Quantum optics/Atomic physics/Laser
Type of internship
Théorique, numérique Description
The applicant will have opportunities to explore hyper-Ramsey interferometry within a basic qudit system with equally spaced levels in energy. Very important steps and key techniques in atomic or molecular spectroscopy of qubit transitions based on composite pulses eliminating probe induced frequency-shifts have already been studied (Report on Progress in Physics 81, 094401 (2018)). The main theoretical objective will be now to transfer some of these qubit results to a qudit architecture connecting SU(2) dynamical symmetry with the Majorana-Rabi decomposition formula, a direct analytical solution of the population dynamics of any spin J = {1,3/2,2,5/2…} that can be decomposed into an arbitrary combination of spin ½. An efficient quantum algorithm using the Majorana formula re-derived by Schwinger will be proposed to reduce time computation of arbitrary interrogation pulse protocols of the N-level system interacting with N-1 identical coherent electromagnetic fields.
Contact
Thomas Zanon-Willette
06/11/2023
/
Thesis :
Funding :
45
Quantum interferometer for gas detection
Domaines
Quantum optics/Atomic physics/Laser
Quantum optics
Non-linear optics
Type of internship
Expérimental Description
We propose to study an interferometer including two optical frequency conversion crystals (i.e. twin photon generators), and compare the key parameters under the quantum and classical regimes. The main asset of this non-linear interferometer is to be able to probe an object in the infrared (like a gas showing strong absorption lines), while detecting all the photons in the visible spectrum, where photodetectors are very sensitive.
The internship will consist in using the current interferometer, which emits at around 1 µm, and compare the quantum and classical regimes, with and without a probed object. The interferometer can then be modified to emit around 2 µm. The internship will provide an opportunity to perfect laser techniques, non-linear optics (frequency conversion) and quantum optics (correlation measurements, coincidences, etc.).
Contact
Jean-Michel Melkonian
06/11/2023
/
Thesis :
Funding :
46
Nonlinear TeraHertz surface plasmon resonators
Domaines
Condensed matter
Quantum optics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Non-linear optics
Type of internship
Expérimental Description
The aim of this PhD thesis will be to develop THz plasmonic cavities and to study their nonlinear behaviour when subjected to intense THz pulses. A main goal of the project will be to realize analogues of nonlinear optics in the THz frequency range, such as harmonic generation, parametric conversion, optical bistability, etc. Overall, this would allow to help bridging the so-called “THz gap”. The project will cover aspects such as the design, the fabrication and the measurement of plasmonic resonators. The experimental studies will be a complemented with numerical simulations, both in the linear and nonlinear regime of light matter interaction.
Contact
Yannis LAPLACE
06/11/2023
/
Thesis :
Funding :
47
Fermionic-bosonic qubits
Domaines
Quantum information theory and quantum technologies
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Type of internship
Expérimental et théorique Description
One of the most promising architectures in large-scale quantum information processing is the one based on superconducting electrodynamic (bosonic) qubits. They rely on an elementary device: the Josephson tunnel junction, a tunnel barrier between two superconducting leads, which exhibit nonlinear and non-dissipative behavior. Josephson tunnel junctions are only an example of superconducting weak links, among which are also atomic contacts and semiconducting nanowire weak links. In these other examples, localized, fermionic states, known as Andreev levels, can be addressed. We recently performed their spectroscopy and quantum manipulation.
Our current endeavor is to pioneer a new hybrid qubits that merge both bosonic and fermionic degrees of freedom. This groundbreaking fusion is set to propel us toward more resilient quantum states. As a part of our team, you'll have the opportunity to participate in designing, fabricating, and measuring these novel qubits. If you're passionate about quantum physics and eager to make a meaningful impact in this exciting field, we welcome you to join us on this inspiring journey.
Contact
MARCELO GOFFMAN
05/11/2023
/
Thesis :
Funding :
48
Quantum Simulation with Ultracold Fermi gases
Domaines
Quantum optics/Atomic physics/Laser
Quantum gases
Type of internship
Expérimental et théorique Description
Strongly-correlated fermions are ubiquitous in nature, from the quark-gluon plasma of the early universe to neutron stars found in the outer space, they lie as well at the heart of many modern materials such as high-temperature superconductors, colossal magneto-resistance devices or graphene. While being a pressing issue covering a wide fundamental and technological scope, the understanding of strongly-correlated fermions constitutes a serious challenge of modern physics.
The contribution of ultracold gas experiments in this outstanding quest resides in the ability to set fermions in a well-characterized environment. In these systems, one can add a single ingredient at a time (spin mixture, interactions, lattice, etc) with a high degree of control, allowing for an incremental complexity, which represents an ideal playground for a direct comparison to many-body theories.
Our group aims at understanding the behavior of strongly-interacting fermionic systems using an atom-based quantum simulator featuring single-atom imaging and manipulation capabilities. During this internship, you will take your first steps in the team by contributing with an experimental project (several options) with the perspective to join us as a PhD student in the Fall 2024.
Contact
Tarik Yefsah
03/11/2023
/
Thesis :
Funding :
49
Challenging Many-Body Models and Applications in Quantum Matter, Information and Light-Matter Interaction
Domaines
Condensed matter
Statistical physics
High energy physics
Low dimension physics
Nouveaux états électroniques de la matière corrélée
Quantum information theory and quantum technologies
Quantum optics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Théorique, numérique Description
Hello!
Our research group is specialist in the theory of condensed-matter systems, quantum information, quantum optics, mesoscopic physics with links related to high-energy physics.
https://www.cpht.polytechnique.fr/cpht/lehur/Karyn_LeHur.html
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Here are challenging enigma we propose (see details in File in PDF format).
Interested candidates can send their CV and a short letter of motivation to my e-mail address
karyn.le-hur@polytrechnique.edu. We will then discuss. You are welcome.
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I) How to solve many-body quantum models in 2D? Applications in quantum information and matter; II) Curious Fractional Plateaux in Transport and Quantum Hall Physics in Wires; III) Spheres’ model, Topological Quantum Matter, Light and Axion Electrodynamics.
Other possible ideas can be discussed according to interests.
Contact
Karyn Renee Jeannine LE HUR
02/11/2023
/
Thesis :
Funding :
50
Investigation of spin waves at the nanoscale with a quantum sensor
Domaines
Condensed matter
Quantum information theory and quantum technologies
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Quantum sensors take advantage of the extreme sensitivity of quantum systems to external perturbations to accurately measure a broad range of physical quantities such as acceleration, rotation, magnetic and electric fields, or temperature. Among a wide variety of quantum systems employed for sensing purposes, the nitrogen-vacancy (NV) defect in diamond has garnered considerable attention in the last decade for the development of a new generation of magnetometers providing an unprecedented combination of spatial resolution and magnetic sensitivity under ambient conditions. The goal of the present project is to combine the capability of scanning NV microscopy to image nanoscale magnetic textures with its sensitivity to the fluctuating magnetic stray field which is produced by thermally activated spin waves. This combination will offer us the possibility to probe magnetic excitations which are confined inside domain walls. This experiment will allow us to check predictions about the dispersion of spin waves confined inside antiferromagnetic domain walls and to explore the effect of the texture of the domain wall itself on these spin waves.
Contact
Aurore Finco
02/11/2023
/
Thesis :
Funding :
51
Optomechanical measurements beyond the Standard Quantum Limit
Domaines
Quantum Machines
Quantum information theory and quantum technologies
Quantum optics
Type of internship
Expérimental Description
Sensing of mechanical motion is routinely performed by optical interferometry, with some state-of-the-art experiments (for instance, gravitational-wave detection) mostly limited by quantum fluctuations of the laser field. Quantum noise leads to the Standard Quantum Limit (SQL), the smallest possible displacement one can probe with coherent laser light.
Quantum noise and the SQL can however be beaten using quantum squeezed states of light. The goal of this project is to experimentally demonstrate broadband measurements below the SQL with a nanomechanical membrane resonator, using a combination of state-of-the-art subsystems: a frequency-dependent squeezed light source (Optical Parametric Oscillator and rotation cavity), a high-Q optomechanical membrane resonator in the MHz range, and a high-finesse fiber cavity inside a dry dilution fridge. This project is in collaboration with several groups inside the Virgo Collaboration, the Quantum Optics group at Australian National University and the Atom Chip group at LKB.
Keywords: microfabrication, quantum-limited laser sources, nonlinear optics, low-noise electronics, digital feedback loops, dilution cryogenics…
Contact
Pierre-François Cohadon
02/11/2023
/
Thesis :
Funding :
52
Probing ferroelectric order with a quantum scanning probe microscope
Domaines
Condensed matter
Quantum information theory and quantum technologies
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Quantum sensors take advantage of the extreme sensitivity of quantum systems to external perturbations to accurately measure a broad range of physical quantities such as acceleration, rotation, magnetic and electric fields, or temperature. Among a wide variety of quantum systems employed for sensing purposes, the nitrogen-vacancy (NV) defect in diamond has garnered considerable attention in the last decade for the development of a new generation of magnetometers providing an unprecedented combination of spatial resolution and magnetic sensitivity under ambient conditions. The goal of the present project is to extend the functionalities of NV-based quantum microscopes towards the detection of electric fields at the nanoscale, in order to study ferroelectric textures. After a careful characterization of the performances of the NV-based electrometer, we will apply NV-based electrometry to the non-perturbative nanoscale imaging of domain walls in standard ferroelectric materials, before investigating more complex materials like the multiferroic bismuth ferrite or twisted bilayers of van der Waals materials like h-BN.
Contact
Aurore Finco
02/11/2023
/
Thesis :
Funding :
53
Fluorescent artificial atoms in silicon for quantum technologies
Domaines
Quantum information theory and quantum technologies
Quantum optics
Type of internship
Expérimental Description
Building on the great success of microelectronics and integrated photonics industries, silicon is undoubtedly one of the most promising platforms for deploying large-scale quantum technologies. To date, silicon-based quantum chips mostly rely on long-lived electrical qubits, which are either weakly coupled to light or emitting in the mid-infrared range unsuitable for optical fiber propagation. Recently, the host group has shown that silicon hosts many fluorescent point defects that can be optically isolated at single scale and offer a single photon emission at telecom wavelengths.
This internship, which can be followed by a PhD, aims at tackling the optical properties of these new fluorescent artificial atoms in silicon, in order to assess their potential as sources of indistinguishable single photons at telecom wavelengths. The beginning of the internship will be devoted to building a new confocal microscope setup optimized for single defect spectroscopy at cryogenic temperature. The second task will be to analyze the orbital fine structure of individual defects through resonant excitation using a tunable laser. Finally, the trainee will explore the broadening of the emission lines of single defects, with the aim of quantifying the phenomenon of spectral diffusion for these solid-state emitters and assessing the feasibility of a future single-photon coalescence experiment.
Contact
Anaïs Dréau
02/11/2023
/
Thesis :
Funding :
54
Optomechanical nanoscale quantum sensing
Domaines
Quantum Machines
Quantum information theory and quantum technologies
Quantum optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Optomechanics, the interaction between light and mechanical oscillators, is a burgeoning field of research at the interface of quantum optics, mesoscopic physics and mechanical micro/nano systems. Using light, it has recently been possible to control and read-out the quantum states of mesoscopi mechanical resonators. This has been notably achieved with nano-optomechanical disk resonators fabricated in our team, where the simultaneous confinement of light and mechanical motion in a sub-micron volume enables strong optomechanical interaction. The implications of such developments in the field of quantum sensing remain now to be explored.
This PhD project aims to bring mechanical scanning probes into the experimental quantum domain using optomechanics. Quantum theory postulates indeed that energy exchanges between physical systems take place with a certain granularity, in quantities that are multiples of an energy quantum. This quantum regime of interactions has never been illustrated by local mechanical measurements, such as those made with anatomic force microscope (AFM). Detecting the exchange of a single quantum of energy between a physical system and mechanical force probe represents the ultimate level of sensitivity allowed by microscopic laws, and is therefore a considerable scientific and technological stake for sensing applications of optomechanics. This PhD project aims at reaching this experimental regime.
Contact
Ivan Favero
01/11/2023
/
Thesis :
Funding :
55
Diagrammatic Monte Carlo study of the unitary Fermi gas
Domaines
Condensed matter
Statistical physics
Nouveaux états électroniques de la matière corrélée
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Quantum gases
Nuclear physics and Nuclear astrophysics
Type of internship
Théorique, numérique Contact
Félix Werner
31/10/2023
/
Thesis :
Funding :
56
Quantum simulation with an atom-tweezer array in an optical microcavity
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Quantum gases
Type of internship
Expérimental Description
Understanding the dynamics of entanglement and quantum information within a many-body system represents a central challenge in quantum physics, with far-reaching implications for the advancement of quantum technologies. The dynamic properties of the system depend strongly on the range of the interaction between the qubits. In this context, the coupling of cold atoms with the optical mode of a cavity offers a unique platform for engineering infinite long-range interactions between atoms, mediated by the cavity.
At LKB, we have recently accomplished a significant milestone with the development of an experimental setup that combines a high-finesse optical microcavity, allowing us to work in the strong regime of cavity QED, with a high-numerical aperture lens.
The combination of cavity-mediated long-range interactions between atoms and the local control offered by the tweezers opens up new avenues for engineering spatial correlations of entangled states and monitoring their propagation with single-particle resolution. In the realm of quantum simulations, this will allow us to investigate transport phenomena in spin systems. Furthermore, these spatially delocalized entangled states will serve as a resource to perform quantum-enhanced estimation of multiple parameters, a very promising new topic in the field of quantum metrology.
Contact
Romain Long
31/10/2023
/
Thesis :
Funding :
57
Neural networks using the dynamics of magnetic tunnel junctions
Domaines
Condensed matter
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
Running and training artificial neural networks on conventional computers consumes a large amount of energy. Our team studies how to build novel hardware for artificial intelligence, that physically implements neural networks using spintronic nanodevices.
In particular, we leverage the high-speed dynamics of magnetic tunnel junctions to implement the key operations of neural networks.
This internship requires to be interested in learning new concepts and tools from both physics and machine learning.
Contact
Frank Mizrahi
30/10/2023
/
Thesis :
Funding :
58
Effets collectifs dans l'interaction d'un ensemble d'atomes et d'un champ lumineux de faible intensité: réabsorption de photons
Domaines
Quantum optics/Atomic physics/Laser
Quantum optics
Quantum gases
Type of internship
Théorique, numérique Description
Lors de ce stage, nous nous intéresserons à l'une des multiples manifestation du comportement collectif apparaissant lors de l'interaction entre la lumière et un ensemble atomique. Plus précisément, nous étudierons le phénomène de réabsorption de photons, en lien avec une problématique expérimentale liée à l'expérience de puce atomique du Laboratoire Charles Fabry. Le but est de déterminer les limitations d'une méthode de sélection spatiale récemment implémentée dans l'expérience.
Contact
Isabelle Bouchoule
30/10/2023
/
Thesis :
Funding :
59
Durée de vie des phonons dans les gaz de Bosons unidimensionnels
Domaines
Low dimension physics
Nonequilibrium statistical physics
Non-equilibrium Statistical Physics
Quantum gases
Type of internship
Théorique, numérique Description
Lors de ce stage, nous effectuerons une étude numérique et théorique de l'amortissement des phonons dans les gaz de Bosons unidimensionnels. Différents résultats contradictoires ont été publiés et nous tâcherons d'élucider cette contradiction. Nous nous intéresserons à la limite des interactions faibles dans laquelle le système peut être décrit par une approche de champ classique. Le problème peut alors être simulé sur un ordinateur classique.
Contact
Isabelle Bouchoule
30/10/2023
/
Thesis :
Funding :
60
Broadband THz Plasmonic metasurface for sensing and modulation with 2D materials
Domaines
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Théorique, numérique Description
Detecting an ultra small amount of matter requires to dramatically confine the EM field in order to improve light-matter interactions. Helmholtz resonators (see figure), composed of a small (ultra-subwavelength) aperture on the surface of a large cavity, funnel light into the cavity through the aperture providing giant local electric field enhancement in the aperture. Helmholtz resonators have been demonstrated as a powerful design for sensing applications.
The traditional paradigm of sensing applications is to design a system displaying a high quality factor resonance at a target wavelength (an absorption line of a chemical species to detect). In presence of absorption, the resonant behavior of the system is perturbed. The detection signal that is monitored is limited to this single target wavelength.
We have recently demonstrated the possibility of detecting several absorption lines within the IR with a single broadband resonator arising from Helmholtz’s configuration operating in reflection. When depositing a few nanometers layer of material, the reflection of the system displays notable dips at the absorption lines of the layer.
The goal of the project is to design sub-wavelength THz resonator arrays (plasmonic metasurfaces) inspired by Helmholtz’s configuration. The internship will focus on the design of devices for molecular fingerprint measurements with a single resonator based metasurface in the THz domain.
Contact
Benjamin Vest
30/10/2023
/
Thesis :
Funding :
61
Quantum metamaterials for arbitrary control of light source properties
Domaines
Quantum optics/Atomic physics/Laser
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
A light-emitting system consists of an active material (laser, LED, incandescent source…) and of elements manipulating the light: lenses, filters and polarizers shaping the directivity, spectrum, and polarization. Adding elements inevitably leads to bulky, energy inefficient and more expensive optical systems. Hence, fabricating sources making the best out of their supplied energy is crucial to reduce environmental footprint of light-related applications.
The vision of the project is to fabricate a less than 1 μm thick light emitting system, providing light with high efficiency, controlled spectrum, angular distribution, and polarization : in other words, arbitrary wavefront control with no external manipulation needed.
This will be achieved by designing and fabricating Light-Emitting Metasurfaces (LEMs). LEMs are arrays of nanoresonators with luminescent emitters distributed over the entire surface of the device. The array of resonators is designed to provide an extended, electromagnetic mode, incoherently pumped by the emitters distributed over the whole system, then mediating the emission by leaking radiation into the far field. Hence, the properties of the emission can be shaped by engineering the radiative losses of an extended leaky mode.
The goal of the internship is to engineer and characterize light sources based on ensembles of quantum dots directly delivering light with controlled properties, that is quantum metamaterials for light-emitting metasurfaces.
Contact
Benjamin Vest
30/10/2023
/
Thesis :
Funding :
62
Quantum light emission with color centers in 2D materials coupled to metasurfaces
Domaines
Quantum optics/Atomic physics/Laser
Quantum optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
Hexagonal Boron Nitride (h-BN) is a 2D material that hosts colored centers emitting single photons in the visible range. h-BN has the remarkable property of displaying remarkable brightness and great photophysical properties at ambient temperature making it a good candidate for single photon emission in less constraining temperature conditions.
Emission of a single photon can be achieved using a two-levels system and controlling its excitation. An important issue is to control the emission mode and the emission time. This can be achieved by controlling the environment and the excitation of the emitter. 2D nature of hBN enables to envision original strategies to achieve coupling between color centers and nanostructures for the control of single photon emission.
The long term goal of the project is to demonstrate controlled positioning of emitters around nanostructures with unprecedented accuracy in order to fabricate complex structures. For instance, one could stack two emitters in close proximity to control spontaneous emission. Their mutual coupling provides a means to control in time domain the emission : this single photon emitting system with an adaptable bandwidth could be useful to build quantum memories, able to store and release quanta on demand. Metasurfaces can also be used to collect optimally the single photon flux and provide an arbitrary control of the wavefront.
Contact
Benjamin Vest
30/10/2023
/
Thesis :
Funding :
63
Quantum states of motion of a mechanical resonator
Domaines
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Quantum information theory and quantum technologies
Quantum optics
Type of internship
Expérimental et théorique Description
Similarly to single atoms, the motion of massive, mesoscopic-scale mechanical resonators can behave quantum mechanically when cooled down to ultra-low temperatures. The study of quantum states of motion of such systems has fundamental and practical interests: for testing quantum mechanics in systems beyond the few-particle ensembles, its interplay with gravitation; also in force sensing, or as a light-matter interface for the development of quantum communication networks, in particular for storing and transducing the quantum information. This internship/PhD project aims at transforming a given input mechanical quantum state to any arbitrary target state in an optomechanical resonator such as the microdisk pictured above and developed in our group. The mechanical quantum information can be encoded in the device through its interaction with light, and then characterized through optical tomographic reconstruction. This work will also consider increasing the dimensionality by including several optomechanical resonators, thereby involving entanglement between massive objects.
Contact
Adrien Borne
30/10/2023
/
Thesis :
Funding :
64
Propagation of correlations in a strongly-interacting quantum gas
Domaines
Quantum optics/Atomic physics/Laser
Low dimension physics
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Non-equilibrium Statistical Physics
Quantum gases
Type of internship
Expérimental Description
Our team has built a new ultracold strontium experiment to study the relaxation dynamics of quantum gases in two-dimensional optical lattices using single-atom resolved fluorescence microscopy. Recent theoretical advances have put forward a very simple picture: the dynamics of such system would be essentially local, meaning that it would take a finite time for correlations between two distant regions of space to reach their equilibrium value, as happens in relativistic theory because of the limit imposed by the speed of light. This locality would be an emergent collective property, similar to spontaneous symmetry breaking, and have its origin in the propagation of quasiparticle excitations.
The intern will join a team of two PhD students, learn how to run the experiment, and directly participate in the first measurements of the propagation of correlations. The idea is to study of the relaxation dynamics of the after a so-called quantum quench. In practice, the gas will initially be prepared in the ground state of the optical lattice and then set out of equilibrium by suddenly varying the lattice depth. Of particular interest will be the quantum critical region in the vicinity of the superfluid-to-Mott insulator transition, where quasiparticles are expected to be strongly interacting, and therefore cannot be the carrier of ballistically propagating correlations, which goes against the simple picture described above.
The intern is expected to pursue with a PhD thesis.
Contact
Marc Cheneau
27/10/2023
/
Thesis :
Funding :
65
Spectral broadening of single colloidal nano-emitter under high excitation
Domaines
Condensed matter
Quantum optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
CdSe/CdS core/shell nanocrystal are excellent bright nano-emitters, awarded by the Nobel Price 2023. At room temperature, they behave as high quantum efficiency single photon source thanks to the electronic confinement and efficient Auger processes. Single photon emission can be described by the recombination of a single exciton within a simple two-level system. Under low excitation power at room temperature, the emission linewidth is approximately Δ𝜆 ≈ 20 nm. However, by increasing the excitation power, emission spectrum broadens dramatically up to Δ𝜆 ≈ 150 nm. Moreover, the emission intensity grows non-linearly with increasing excitation power. The two- levels system paradigm fails for interpreting those features. We have recently developed a model based on the radiative recombination of multiple excitonic levels within a single nanocrystal , relying on statistical description of electron and hole populations in a quasi-equilibrium and on their recombination.
During the internship the student will consider different types of nano-emitter, quantum dots or quantum wells, and will study their emission under high excitation. He/She will then analyse the experimental datas using among others Bayesian methods, and extent our theoretical model.
During the PhD, in the framework of the ANR CoLIMe, starting in 2024, and in continuity of the internship, we will study strong coupling between multiexcitonic emission of those nanoemitters and plasmonic antennas.
Contact
Agnes MAITRE
26/10/2023
/
Thesis :
Funding :
66
Les analogues quantiques acoustiques : de la théorie aux expériences
Domaines
Soft matter
Physics of liquids
Quantum Machines
Quantum information theory and quantum technologies
Hydrodynamics/Turbulence/Fluid mechanics
Type of internship
Expérimental et théorique Description
Dans ce projet, notre objectif est d'étudier théoriquement, numériquement et expérimentalement la
possibilité de réaliser des analogues quantiques acoustiques qui permettraient d'explorer les possibilités et limites de la théorie des ondes pilotes. Ce travail est lié à notre récente découverte théorique selon laquelle des sources acoustiques peuvent être transportées par leur propre onde acoustique, grâce à la force de radiation acoustique résultant d'une asymétrie créée par l'effet Doppler lorsque la particule commence à se déplacer [4,5]. En particulier, nos principaux objectifs seraient de démontrer la possibilité d’un analogue classique du spin avec une dualité onde-particule et d'étudier l'intrication pour les systèmes classiques.
Contact
Alexis Duchesne
26/10/2023
/
Thesis :
Funding :
67
Quantum simulation based on Floquet engineering
Domaines
Quantum optics/Atomic physics/Laser
Low dimension physics
Quantum information theory and quantum technologies
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Quantum gases
Type of internship
Expérimental et théorique Description
Le sujet propose d'étudier, puis d'implémenter expérimentalement des Hamiltonien d'intérêt pour la simulation quantique grâce à des modulations rapides de paramètres. Il s'agit d'un exemple d'application de la théorie de Floquet. Le stage se focalisera sur des exemples précis modèle SSH, observations d'états topologiques, mise en évidence de la localisation d'Anderson. La thèse élargira le champ d'application grâce à la prise en compte du degré de liberté interne (spin) et de dimensions supplémentaires. L'expérience se fera sur un condensateur de Bose Einstein dans un réseau optique.
Contact
David Guéry-Odelin
26/10/2023
/
Thesis :
Funding :
68
Tying knots of darkness with incoherent light
Domaines
Condensed matter
Non-equilibrium Statistical Physics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
The past few years have witnessed impressive developments in optical sources capable of emitting light with non-trivial phase and/or polarization patterns, such as optical vortices. These structured beams are of interest in many scientific fields ranging from sub-diffraction imaging techniques to optical tweezers. Because structured beams are carved by carefully tailored interferences, their construction requires light possessing a high degree of coherence—typically light produced by a laser.
One research direction pursued by our team is to achieve the same feat with sources of non-lasing light. Non-lasing light (e.g. light from the sun, from LEDs, from candles…) lacks of the coherence properties of lasers, meaning that it is not in principle possible to shape all the emitted photons into a single beam. Our strategy to overcome this fundamental limit is to hybridize a luminescent medium with a structured pattern (a “metasurface”). Rather than emitting random photons in free space, the luminescent medium will emit light with properties dictated by the metasurface. We have already validated these ideas for optical vortices and beams with azimutal polarization.
The goal of this internship is to generalize these results to vortex knots and vortex links, which are beams with dark phase singularities that form non-trivial topologies such as interlaced or knotted loops. The work will include calculations, cleanroom fabrication and optical characterization.
Contact
Aloyse Degiron
26/10/2023
/
Thesis :
Funding :
69
TeraHertz cavity electrodynamics of superconducting collective modes
Domaines
Condensed matter
Nouveaux états électroniques de la matière corrélée
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Strong light-matter interactions between quantum materials and the vacuum field of cavities at TeraHertz (THz) frequencies is emerging as a new frontier for the control of material properties. Among quantum materials, superconductors (SC) hold a special place and a timely question has arisen regarding the possibility to tune their spectacular properties by dressing their collective modes with THz cavity photons. In this internship, we propose to study the collective modes of NbSe2, an exotic SC exhibiting simultaneously SC and a charge density-wave (CDW) state. Of particular interest will be to investigate the dynamics of its Higgs-mode, an analogue of the Higgs-boson in SCs, and its interaction with the CDW mode. This will be achieved with a combination of equilibrium THz time-domain spectroscopy and pump-probe THz spectroscopy. The first steps towards integration of this SC inside THz cavities and the dressing of its collective modes will carried out. The consortium of this collaborative project also includes experts in Raman spectroscopy and the theory of condensed-matter and SCs.
Contact
Yannis LAPLACE
25/10/2023
/
Thesis :
Funding :
70
Quantum Simulation of Twisted Bilayer Systems using Ultracold Quantum Gases
Domaines
Quantum optics/Atomic physics/Laser
Quantum optics
Quantum gases
Type of internship
Théorique, numérique Description
Twisted bilayer lattice materials are fascinating systems, with exotic quantum properties. They can be emulated in ultracold-atom quantum simulators. The aim of this project is to investigate their physics using a combination of analytical work and advanced numerical approaches, of which our group is expert.
Contact
Laurent SANCHEZ-PALENCIA
25/10/2023
/
Thesis :
Funding :
71
Continuous superradiant laser with a laser cooled atomic beam
Domaines
Quantum optics/Atomic physics/Laser
Quantum optics
Metrology
Type of internship
Expérimental Description
Atomic clocks are vital components in modern technologies as well as in fundamental physics experiments. Recently, a new type of clock has been proposed: the “superradiant laser”. Instead of shining a stable laser onto cold atoms to probe their resonance frequency, the clock would operate by letting the atoms themselves emit light. The atoms would be placed in an optical cavity, but unlike a traditional laser, the emission process will rely on a collective synchronization of the atomic dipoles (superradiance), and the light frequency and coherence will mostly depend on the atoms. Thus, in addition to its significance as a new clock architecture, this system is interesting from a fundamental point of view: it is an example of an open-dissipative system in which correlations of quantum nature may naturally arise.
We have built a prototype for a cold-atom-based superradiant laser. It relies on a beam of strontium atoms inside a vacuum chamber, guided by laser cooling up to an optical cavity, there to emit light in a superradiant fashion. The intern will be in charge of laser cooling and guiding atoms into the cavity, observing the first signs of collective interaction between the atoms and the light field in the cavity, and ultimately detecting superradiant emission. This work can then be continued into a PhD project, to understand how the emitters synchronize their oscillations, and contribute to assessing the interest of superradiant lasers as clocks.
Contact
Martin Robert de Saint Vincent
25/10/2023
/
Thesis :
Funding :
72
Dissipative preparation of quantum-correlated states of ultracold fermions
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Statistical physics
Nonequilibrium statistical physics
Quantum gases
Metrology
Type of internship
Expérimental Description
We offer an experimental internship in the field of ultracold atoms and quantum simulation. We study degenerate atomic gases, produced by laser cooling techniques and arranged on a periodic structure created by interfering laser beams. This setting leads to the production of strongly correlated fermions, prone to collective quantum phenomena such as magnetism and entanglement.
In the search for quantum effects, typically, environments are considered detrimental, sources of decoherence. However, in specific cases, couplings to an environment can actually produce and stabilize non-trivial states. This exciting new idea means that quantum phenomena may be harvested for quantum simulation or sensing (clocks, atom interferometers) in a more robust manner than formerly thought.
Our system is suited to explore both sides of the problem: Hamiltonian evolution towards entangled states, driven by anti-ferromagnetic interactions and coherent spin manipulations, and dissipative control. The intern will join during experiments in the Hamiltonian regime. In parallel, he/she will build a new laser system targeting the ultranarrow clock line of strontium, enabling a whole new set of schemes to measure quantum correlations.
The internship is meant to act as introduction for a PhD on dissipative control. By introducing photo-association losses, we aim at demonstrating the robust production of a new set of quantum-correlated states, and at investigating their advantages for quantum sensors.
Contact
Martin Robert de Saint Vincent
25/10/2023
/
Thesis :
Funding :
73
Universal deterministic single ion "implantor" setup with nanometric accuracy
Domaines
Quantum optics/Atomic physics/Laser
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Quantum circuits, made from specific doped materials, are foundational for quantum communication and computing. But, current ion implantation techniques face limitations due to non-deterministic ion sources and accuracy constraints.
We propose here to develop a high-precision, universal ion "implantor" setup for applications in semiconductors and quantum technology. For this we will take advantage of the correlation between each electron/ion pair, resulting from the ionization of an atomic beam, to actively control the ion passing trajectory based on the extra information given by the electron, as already developed on Cs atoms [Phys. Rev. Applied 11, 064049 ]. This development of a controlled source of ions at the sub-nanometric scale will open unique perspectives for implantation, etching, deposition and imaging experiments and will allow the development of a revolutionary analytical instrument in the semiconductors field.
For this we will adapt the cesium atomic beam system by using femtosecond pulsed multiphoton ionization to ionize atomic samples, creating a "cold" ion source for better accuracy. The use of other ions will allow us to realize precise ion trajectory control and deterministic single-ion creation. The internship will consist of testing the approach with Cs on the existing setup. The next steps, possibly in PhD, will consist of developing a deterministic Bi or N source, to integrate with a new FIB column to finally achieve nanometer scale implantation.
Contact
Daniel Comparat
25/10/2023
/
Thesis :
Funding :
74
Electron Electric Dipole Moment using Cs in cryogenic matrix
Domaines
Quantum optics/Atomic physics/Laser
Metrology
Type of internship
Expérimental Description
Electric Dipole Moments (EDMs) of electrons, neutrons or nuclei are sensitive probes for new physics beyond the Standard Model of particle physics. In the present project (EDMMA: Electric Dipole Moment with atoms and molecules in Matrix), we propose to measure the electron EDM using embedded particles in a cryogenic solid matrix of rare gas or hydrogen. Matrices offer unprecedented sample sizes while maintaining many characteristics of an atomic physics experiment, such as manipulation by lasers. An EDM experiment on atoms and molecules in inert gas matrices has the potential to reach a statistical sensitivity in the order of 10-36e.cm; a value several orders of magnitude beyond that of any other proposed technique. In a strong collaboration between experimental (LAC, ISMO,LPL) and theoretical (CIMAP) groups, we seek to perform a detailed investigation of all limiting effects (trapping site dependence of optical pumping and coherence times mainly) using metal atoms (Cs typically) in argon and parahydrogen matrices in view of a first proof of principle EDM measurement. This will pave the way toward unprecedented sensitivity. During this internship (that can continue in a PhD) we propose to setup the cryostat with argon and make the first test of RF spin dynamics and hyperfine structure study of cesium embedded in an argon matrix.
Contact
Daniel Comparat
25/10/2023
/
Thesis :
Funding :
75
Trous noirs artificiels dans les fluides quantiques de lumi`ere
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Relativity/Astrophysics/Cosmology
Quantum optics
Non-linear optics
Quantum gases
Type of internship
Théorique, numérique Description
Les photons sont d'excellents porteurs d'information, mais ils n'interagissent généralement pas entre eux.
Les atomes interagissent, mais ils sont difficiles à manipuler et ne bénéficient pas de l'arsenal de l'optique quantique pour détecter les fluctuations quantiques et l'intrication.
Notre approche pour marier ces deux systèmes pour la simulation quantique consiste à utiliser des exciton-polaritons dans des microcavités semi-conductrices.
Notre équipe utilise cette plateforme pour simuler des effets astrophysiques à proximité de trous noirs artificiels, avec de la lumière.
Contact
Quentin Glorieux
25/10/2023
/
Thesis :
Funding :
76
Artificial black holes in exciton-polariton fluids of light.
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Relativity/Astrophysics/Cosmology
Quantum optics
Non-linear optics
Quantum gases
Type of internship
Expérimental Description
Photons are great carriers of information but they usually don’t interact with one another.
Atoms interact but are hard to manipulate and do not benefit from the toolbox of quantum optics for detecting quantum fluctuations and entanglement.
Our approach to marry these two systems for quantum simulation is to use exciton-polaritons in semi-conductor microcavity.
Our team is using this platform to simulate astrophyics effects near artificial black holes with light.
Contact
Quentin Glorieux
25/10/2023
/
Thesis :
Funding :
77
Theory of atom-photon and spin-photon interfaces: from cavity-QED to waveguide-QED
Domaines
Quantum optics/Atomic physics/Laser
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Quantum information theory and quantum technologies
Quantum optics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Non-linear optics
Type of internship
Théorique, numérique Description
The rise of cavity-QED has made it possible to fully exploit the light-matter interaction, at the most fundamental level: single atoms and single photons.
Our team in C2N has developed quantum-dot-based interfaces which can be used as efficient emitters of single photons, leading to the creation of the company Quandela. A strong challenge remains: developing quantum nodes that implement logic operations on incoming photons, using the interaction with a single stationary qubit.
During the last decade, we have also built a practical theoretical toolbox, allowing to simulate the cavity-QED effects in light-matter interfaces. By doing so, we made a theoretical breakthrough: it becomes possible to exactly describe many complex cavity-QED phenomena, with the much simpler and practical framework of waveguide-QED. This will allow implementing numerical and analytical strategies which were previously out of reach.
During this internship, we want to explore the potential of this breakthrough, by demonstrating its full validity and extending it to future applications. In addition to fundamental research, a long-term goal will also be to develop a plug & play simulation platform that any experimentalist could use, to predict the results of complex experiments, with any kind of light-matter interface.
Contact
Loïc Lanco
24/10/2023
/
Thesis :
Funding :
78
Quantum microwave detection using a super-inductance circuit
Domaines
Condensed matter
Quantum information theory and quantum technologies
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
With the advent of circuit quantum electro-dynamics, the most advanced platform to realize fully controllable and scalable quantum processors using superconducting quantum bits, the vector of information has become microwave photons in the [4-8]~GHz band. Developing an efficient and fast microwave photo-electron converter thus holds immense promise in advancing quantum computing, communication and sensing. In this context we have very recently realized a microwave photon to electron converter in which a superconducting tunnel junction acts as a voltage tuneable quantum absorber through the photon-assisted tunneling of quasiparticles. The achieved quantum efficiency, estimated from the measured photo-assisted current, approaches unity. This finding paves the way for the proposed project which aims at detecting single microwave photons using charge detection techniques using superinductances currently under development in the lab. The student will join the project lead by 2 permanent researchers, 1 graduating phd student and 1 post-doc. The goal will be to develop charge detection using superconducting circuits made out of granular aluminum, a disordered superconductor, realized in a nanofabrication clean room by electron beam lithography and metal evaporation. Measurements will then be carried in a brand new dilution refrigerator with base temperature of 20mK and high precision electronics.
Contact
Julien Basset
24/10/2023
/
Thesis :
Funding :
79
Widely tunable ultra-stable and SI-traceable quantum cascade lasers for frequency metrology and mid- infrared precise spectroscopy: application to space, atmospheric and fundamental physics
Domaines
Quantum optics/Atomic physics/Laser
Metrology
Type of internship
Expérimental Description
Ultra-high resolution molecular spectroscopy is an interdisciplinary field with fascinating applications ranging from fundamental physics to astrophysics, earth sciences, remote sensing, metrology and quantum technologies. Among recent instrumental advances, the stabilization of quantum cascade lasers (QCLs) on optical frequency combs with traceability to primary frequency standards, a method recently implemented in our team, is a breakthrough technology. It offers an unprecedented level of precision in the mid-infrared, an essential region known as the molecular fingerprint region, which hosts a considerable number of intense vibrational signatures of molecules of various interests. This opens up prospects for carrying out fundamental physics tests and exploring the limits of the Standard Model, and for providing precise spectroscopic data on species of astrophysical or atmospheric interest, which is a crucial information for environmental and human health issues.
We have for instance recently measured rovibrational frequencies in methanol with 11-digits accuracy by carrying
out saturated absorption spectroscopy in a multi-pass cell and in a Fabry-Perot cavity enhanced spectroscopy, a
more than 4 orders of magnitude improvement compared to previous measurements reported in the literature.
Contact
Mathieu Manceau
24/10/2023
/
Thesis :
Funding :
80
Precision Measurements and tests of fundamental physics with cold molecules
Domaines
Quantum optics/Atomic physics/Laser
Metrology
Type of internship
Expérimental Description
The master student will participate in the development of a new-generation molecular clock specifically designed
for precision vibrational spectroscopy of cold molecules in the gas phase. The proposed technology is at the
forefront of cold molecule research and frequency metrology, and opens possibilities for using polyatomic
molecules to perform tests of fundamental physics and explore the limits of the standard model. The apparatus will
be used in the first place for measuring the electroweak-interactions-induced tiny energy difference between
enantiomers of a chiral molecule, a signature of parity (left-right symmetry) violation, and a sensitive probe of dark
matter.
The master student will take an active role in various aspects of the developments of the experiment. She/he will:
- set up the mid-IR quantum cascade laser system at 6.4 μm to probe molecular vibrations in this spectral
region;
- perform first Doppler and sub-Doppler absorption spectroscopy on cold molecules produced at ~1 K in a
novel cold molecule apparatus, with a particular focus on well-chosen promising chiral and achiral organo-
metallic species and polycyclic aromatic hydrocarbons.
Contact
Mathieu Manceau
24/10/2023
/
Thesis :
Funding :
81
Distributed surface code lattice surgery
Domaines
Quantum information theory and quantum technologies
Quantum optics
Type of internship
Théorique, numérique Description
The creation of a network of medium scale quantum computing cells connected to each other by means of entanglement is establishing as one the most promising approach towards large scale quantum computing. The project aims to extend the most common error correction protocol -- the surface code with a lattice surgery construction – to the distributed setting. The basic idea is to perform stabilizer measurements across physically separated cells by means of shared noisy entangled Bell pairs.
In this framework, the intern will have to finely understand the specificities of error correction codes and use known or develop its own simulator of noisy quantum circuits to efficiently evaluate the threshold and overhead of a distributed surface code. In parallel, the intern will investigate a large scale quantum algorithm -- like Shor’s algorithm -- to estimate precisely the resource and runtime needed to run such an algorithm on a physical platform using cat qubits and driven by a distributed surface code lattice surgery.
The intern will be supervised by N. Sangouard (CEA-Saclay), E. Gouzien and J. Guillaud (Alice&Bob). Depending on the student motivations, the internship might be followed by a PhD thesis (already funded) between CEA-Saclay and Alice&Bob.
For a recent publication relevant for the project, see
E. Gouzien, D. Ruiz, F.-M. Le Régent, J. Guillaud & N. Sangouard, Phys. Rev. Lett. 131, 040602 (2023) ; arXiv:2302.06639
Contact
Nicolas Sangouard
24/10/2023
/
Thesis :
Funding :
82
Quantum imaging with non-degenerated entangled photons
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Quantum information theory and quantum technologies
Quantum optics
Non-linear optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Metrology
Type of internship
Expérimental Description
Quantum imaging (QI) is a rapidly developing field of research with stunning progresses and emerging societal applications. Quantum-enhanced imaging schemes harness the beneficial properties of entangled photon pairs allowing transferring amplitude and phase information from one photon state to the other. The technique is however still in its infancy and we propose to go beyond the state of the art. The main goal is to develop advanced QI protocols that exploits photon pairs at extreme wavelengths from near infrared to the visible down to the deep UV using a non-classical source based on high harmonic generation (HHG). The main objective of the internship will consist in using a pair of non-degenerated entangled photons at 2 harmonics from the HHG frequency comb to perform a quantum imaging experiment in the far field regime. We will study the possibility of transferring the sensing and resolution benefit from one spectral range to another one. Indeed, an intriguing question is about the spatial resolution achievable in the QI scheme, especially in the case of non-degenerate photon pairs. The quantum correlations between the two photons from the same harmonic generation process will be used to transfer amplitude and phase information between the two photons. In the diffractive regime, and in a "ghost diffractive imaging" configuration based on the coincident detection of the two entangled photons.
Contact
Hamed Merdji
24/10/2023
/
Thesis :
Funding :
83
Evidence of multipartite entanglement in semiconductor high harmonic generation
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Nouveaux états électroniques de la matière corrélée
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Quantum information theory and quantum technologies
Quantum optics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Non-linear optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Metrology
Type of internship
Expérimental Description
Quantum information science and imaging technologies reach some bottleneck due to limited scalability of non-classical sources. Future breakthroughs will rely on high production rate of various quantum states in scalable platforms. Generally, multipartite entanglement with N>2 suitable for quantum applications is difficult to achieve because of the low efficiency of the traditional schemes. Intrinsically, the HHG emission comes as a frequency comb and should exhibit N-partite entangled photons. Practically, the internship project will consist in extensively study the non-classical properties of the HHG process in a semiconductor for N>2. In the process, each emitted photon is a superposition of all frequencies in the spectrum, i.e., each photon is a comb so that each frequency component can be bunched and squeezed. The candidate will first develop and test entanglement and quantum correlations using the violation of Cauchy-Schwartz inequality. We will verify genuine multipartite entanglement of the photons in the time/frequency domain, by correspondingly measuring the longitudinal position as well as the frequency bandwidth. The approach will be further extended to verify multi-partite entanglement between even more optical modes. The Bell-like inequalities will therefore be generalized to witness entanglement between more than three mixed quantum states.
Contact
Hamed Merdji
24/10/2023
/
Thesis :
Funding :
84
Attosecond control of quantum states of light
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Quantum information theory and quantum technologies
Quantum optics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Non-linear optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
High-harmonic generation is a light up-conversion process occurring in a strong laser field, leading to coherent attosecond bursts of extreme broadband radiation. As a new paradigm, attosecond electronic or photonic processes such as high-harmonic generation (HHG) can potentially generate non-classical states of light well before the decoherence of the system occurs. This could address fundamental challenges in quantum technology such as scalability, decoherence or the generation of massively entangled states with ultrafast processing. The internship will consist in realizing a platform that will allow controlling the carrier to envelope phase (CEP) of the laser that drives the semiconductor HHG emission. The CEP of the laser will allow controlling the non-classical state, in connection with our recent finding in various semiconductors (Theidel et al, submitted to Nature, in review). Single and multi-beam intensity cross-correlation, two-mode squeezing in the generated harmonic radiation, which depends on the laser intensity will be investigated. We will test the violation of the Cauchy-Schwarz inequality that realizes a direct test of multipartite entanglement in high-harmonic generation. The attosecond control of light states open the vision of quantum processing on unprecedented timescales, an evident perspective for future quantum optical computers. Only candidates motivated to follow with a PhD in this topic will be considered.
Contact
Hamed Merdji
24/10/2023
/
Thesis :
Funding :
85
Anyon statistics in fractional quantum Hall conductors
Domaines
Condensed matter
Nouveaux états électroniques de la matière corrélée
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Two-dimensional systems allow for the existence of quasiparticles with intermediate statistics between fermions and bosons, leading to intermediate degrees of bunching and exclusion. As their exchange phase can take any value, these quasiparticles have been called anyons. Interestingly these quasiparticles keep a memory of the number of exchanges between them, which is protected from local perturbations of the anyons trajectories: one speaks of topological protection. This protection is at the heart of the current interest for anyons, as specific types of anyons, called non-abelian, are the building blocks of topological quantum computing that would be protected from decoherence.
The fractional statistics of anyons has been recently evidenced in 2020 in fractional quantum Hall (FQH) conductors. Using noise measurements in the geometry of an anyon collider, our team at LPENS in collaboration with our partners from C2N demonstrated the fractional statistics of anyons at the filling factor 1/3 of the fractional quantum Hall effect. The 1/3 case corresponds to the simplest FQH state, where the properties of anyons are described by a single number. The purpose of this internship and PhD is to use the geometry of the anyon collider to extensively study the properties of anyons for more complex phases of the FQH effect and in particular in the non-abelian case (filling factor 5/2).
The internship is intended to be followed by a PhD funded by the ERC project ‘ASTEC’.
Contact
Gwendal FEVE
23/10/2023
/
Thesis :
Funding :
86
Créer de la matière artifielle à base de photons dans un Fluide Quantique de Lumière
Domaines
Condensed matter
Nonequilibrium statistical physics
Quantum information theory and quantum technologies
Quantum optics
Non-linear optics
Quantum gases
Type of internship
Expérimental Description
Les photons sont d’excellents porteurs d’information, mais ils n’interagissent généralement pas les uns
avec les autres. Les atomes interagissent, mais ils sont difficiles à manipuler et ne bénéficient pas de
l’arsenal de l’optique quantique pour d´etecter les fluctuations quantiques et l’intrication. De nombreuses
approches ont été proposées pour marier ces deux systèmes en vue de simuler de la matière
condensée avec des photons fortement interagissant, mais à ce jour, la réalisation de matériaux
synthétiques composés de photons fait encore d´efaut.
Notre équipe vise cet objectif ambitieux, à savoir la création de Matiere Photonique Synthétique.
Nous proposons une opportunité de stage (suivie d'une thèse financée par l'ERC) pour étendre les capacités de notre plateforme à un nouveau niveau en augmentant de plusieurs ordres de grandeur les interactions effectives photon-photon et en entrant dans le régime des interactions fortes.
Contact
Quentin Glorieux
23/10/2023
/
Thesis :
Funding :
87
Synthetic Photonic Matter in a Quantum Fluid of Light.
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Statistical physics
Nonequilibrium statistical physics
Quantum optics
Non-linear optics
Non-equilibrium Statistical Physics
Hydrodynamics/Turbulence/Fluid mechanics
Quantum gases
Type of internship
Expérimental et théorique Description
Photons are great carriers of information but they usually don’t interact with one another. Atoms interact but are hard to manipulate and do not benefit from the toolbox of quantum optics for detecting quantum fluctuations and entanglement. Many approaches have been proposed to marry these two systems for quantum simulation of condensed matter with strongly interacting photons, but to date, the realization of large-scale synthetic materials made of optical photons is still missing.
Our team targets this exciting goal, namely the creation of Synthetic Photonic Matter.
We are offering an internship opportunity (followed by an ERC-funded PhD) to expand the capabilities of this platform to a new level by increasing by many orders of magnitude the effective photon-photon interactions and enter the strong interaction regime.
Contact
Quentin Glorieux
23/10/2023
/
Thesis :
Funding :
88
Test of quantum electrodynamics in strong Coulomb field
Domaines
Quantum optics/Atomic physics/Laser
Fields theory/String theory
Metrology
Type of internship
Expérimental et théorique Description
This internship will be centred in the preparation of a new experiment on high-accuracy x-ray spectroscopy of few electrons heavy ions for testing quantum electrodynamics (QED) in strong Coulomb field (the field of the highly charged ion).
On the one hand, to setup the acquisition system of the new detector and to make first tests with fluorescence targets and (possibly) with highly charged ions in our SIMPA installation in the Pierre et Marie Curie campus. On the other hand, the candidate will estimate the sensitivity to the nuclear size and deformation effects for the planned measurement to select the most interesting uranium isotopes to be studied. Some calculations will require the use of the MCDFGME code.
Contact
Martino Trassinelli
23/10/2023
/
Thesis :
Funding :
89
Ultrafast trapping of cold Yb atoms in a transportable optical lattice clock
Domaines
Quantum optics/Atomic physics/Laser
Quantum optics
Quantum gases
Metrology
Type of internship
Expérimental et théorique Description
Optical lattice clocks have reached such a resolution that they can now be controlled at the 18 digits level. This makes them able to detect a change of height of 1 cm, via a general relativity effect called gravitational time dilation. At SYRTE, Observatoire de Paris, we are building a transportable Ytterbium lattice clock, targeting ultrahigh stability, in order to participate to the cartography of the geopotential in the future.
The M2 student will work on the construction of the so-called 'magic' optical lattice, and on the loading techniques to catch atoms efficiently in this trap.
Contact
Rodolphe Le Targat
23/10/2023
/
Thesis :
Funding :
90
Singular wave-based electronspectroscopy
Domaines
Condensed matter
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
Condensed matter systems often exhibit symmetries that make their response to electromagnetic stimuli dependent on those stimuli polarization. Dichroic responses, whether linear or circular, are therefore invaluable for studying various physical properties such as structural, morphological, electronic or magnetic. Historically, dichroism has been studied using polarized photons, mainly in the visible to X-ray range. However, these techniques often lack spatial resolution. Electron spectroscopy, in particular with electron energy loss spectroscopy (EELS), enables atomic resolution, surpassing optical methods. Challenges remain, however, particularly with regard to the creation of electron waves mimicking optical polarization. Recently, we have developed a new theoretical framework showing that the local density of polarized electromagnetic states, can be measured with tools (“phase plate”) that can manipulate the incident beam electronic wave function. This project aims to use this tool to produce electronic wavefunctions that mimic polarization states, and to test these methods on nanometric optical or magnetic structures. It will cover instrumental, experimental and theoretical aspects, appealing to a curious and motivated candidate.
Contact
Odile STEPHAN
22/10/2023
/
Thesis :
Funding :
91
Optical Mapping of Surface Acoustic Waves
Domaines
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Non-linear optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Contact
Mathieu Jeannin
22/10/2023
/
Thesis :
Funding :
92
Experimental realization of quantum-squeezed states of light using optically-levitated nano-objects.
Domaines
Quantum optics/Atomic physics/Laser
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Quantum optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
During this internship, the student will experimentally setup an optomechanical platform consisting of a nanoparticle optically levitated in vacuum. Through a spatial modulation of the input light field, a mechanically-induced correlation between phase and amplitude fluctuations of the optical field will be enforced. Such a correlation will be maximized to achieve a quantum squeezing of the scattered light field. A funding is available to continue and expand this internship through a PhD.
Contact
Nicolas Bachelard
Laboratory : Laboratoire Ondes et Matière d'Aquitaine - UMR 5798
Team : Nanophotonics Group
Team Website
Team : Nanophotonics Group
Team Website
20/10/2023
/
Thesis :
Funding :
93
Quantum chaos & non-Euclidean photonics
Domaines
Quantum optics/Atomic physics/Laser
Relativity/Astrophysics/Cosmology
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Type of internship
Expérimental et théorique Description
Quantum chaos is a research field dedicated to the relationship between a quantum system and its classical counterpart. The predictions are investigated in any wave system, namely quantum, acoustic, microwaves, optics,… Recently, we demonstrated the fabrication of surface-like microlasers by Direct Laser Writing (DLW). The laser modes were located along periodic geodesics (a geodesic is the shortest path between two points on a surface, like the straight line in Euclidean space). It opens the way to a new domain, called Non-Euclidean Photonics. During the internship, the student will investigate microlasers based on a pseudosphere, a surface with constant negative curvature , where geodesics are unstable and the classical dynamics is chaotic.
Contact
Mélanie Lebental
20/10/2023
/
Thesis :
Funding :
94
Brillouin gain spectroscopy of superfluid helium-4 using a single pulsed laser.
Domaines
Condensed matter
Physics of liquids
Type of internship
Expérimental Description
Low temperature helium 4 is a model system for the study of condensed matter. The Quantum Liquid and Solid Group of Laboratoire Kastler Brossel has developed experimental tools to produce and characterize metastable negative pressure states of superfluid helium-4 at about 1 K. The aim of the internship is to develop a Brillouin spectrometer (sound velocity-meter) based on a single pulsed laser capable of measuring not only the speed of sound but also the attenuation of sound in superfluid helium-4.
Contact
Jules Grucker
20/10/2023
/
Thesis :
Funding :
95
AlGaAs sources of quantum states of light : fundamental research and applications to quantum networks
Domaines
Quantum information theory and quantum technologies
Quantum optics
Type of internship
Expérimental Description
The generation of nonclassical states of light in miniature chips is a crucial step toward practical implementations of future quantum technologies. For the sake of practicality and scalability, these quantum sources should be easily produced, operate at room temperature, and be electrically excited and controlled. The work of the QITe team is focused on AlGaAs-based quantum photonic devices: indeed, this platform presents a strong case for the miniaturization of different quantum components in the same chip: strong second-order nonlinearity and electro-optic effect, direct bandgap, generation of entangled photons in the telecom band. After the demonstration of the first electrically driven device working at room temperature and the exploitation of the broadband character of the generated polarization entangled state for the implementation of flexible quantum networks, in this project, the QITe team will push ahead on several fronts:
- devices development
- fundamental studies on frequency-time entanglement for quantum metrology and quantum computing
- participation in the deployment of the national infrastructure of quantum networks
The internship will be experimental to ensure the transfer of know-how with the doctoral student in progress, but the thesis will have a dual experimental/theoretical dimension thanks to the close collaboration with the theoreticians in our group.
Contact
Sara DUCCI
20/10/2023
/
Thesis :
Funding :
96
Quasi-1D Fermi gases
Domaines
Quantum gases
Type of internship
Expérimental et théorique Description
The internship will address some aspects of the physics of ultracold atoms confined in quantum waveguides, in a regime where their dynamics is quasi-one-dimensional and does not obey the usual paradigms of many-body physics in 3D.
Contact
Frédéric Chevy
20/10/2023
/
Thesis :
Funding :
97
Computational fluorescence microscopy
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Statistical physics
Biophysics
Soft matter
Physics of living systems
Quantum information theory and quantum technologies
Quantum optics
Non-linear optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Contact
Hilton Barbosa de Aguiar
19/10/2023
/
Thesis :
Funding :
98
Super-resolution coherent Raman microspectroscopy
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Statistical physics
Biophysics
Soft matter
Physics of living systems
Quantum information theory and quantum technologies
Quantum optics
Non-linear optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Contact
Hilton Barbosa de Aguiar
19/10/2023
/
Thesis :
Funding :
99
Time-domain in compressive Raman microspectroscopy
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Biophysics
Soft matter
Physics of living systems
Quantum optics
Non-linear optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Contact
Hilton Barbosa de Aguiar
19/10/2023
/
Thesis :
Funding :
100
Entropy in Engineered Quantum Systems
Domaines
Condensed matter
Low dimension physics
Nouveaux états électroniques de la matière corrélée
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
"Exotic" electronic correlated-states, such as Majorana fermions, form the basis of a promising approach to quantum computation due to their inherent topological robustness. The broad aim of this experimental internship/PhD is to measure the fractional entropy of new correlated states engineered in quantum circuits. The entropy is predicted to take remarkable fractional values, between 0 and kB ln(2), whose observation would unambiguously demonstrate the fundamental peculiarity of the underlying new states of matter.
Contact
Anne Anthore
19/10/2023
/
Thesis :
Funding :
101
Multiscale Dynamics in bacterial populations
Domaines
Condensed matter
Statistical physics
Biophysics
Soft matter
Physics of living systems
Non-equilibrium Statistical Physics
Type of internship
Expérimental et théorique Description
Bacteria are one the most fundamental and abundant forms of life on Earth. For human health, they represent both a threat, with the emergence of massive multi-resistance to antibiotics, and an opportunity, as the microbiota can positively influence human physiology. The bacterial strains currently studied in research laboratories are very easy to grow and maintain, making them a highly convenient experimental system for studies at both single-cell and population levels. Our lab seeks to understand how the different scales are coupled: from protein dynamics to colony organization. To do this, we use live microscopy and image analysis to capture and model the observed spatial and temporal dynamics.
Contact
Nicolas Desprat
18/10/2023
/
Thesis :
Funding :
102
Photon thermalization in scattering disordered media for new source of light
Domaines
Condensed matter
Statistical physics
Quantum gases
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
In this project we propose to study photon thermalization towards Bose-Einstein condensation in a solution of fluorescent emitters embedded in a strongly scattering medium. Photon thermalization and condensation has been observed for fluorophores inside an optical cavity. Here diffusion replace the cavity and ensures that photons undergo an adequate number of absorption and emission cycles to thermalize with the fluorophores solution.
The study will be performed theoretically, numerically and experimentally. We will explore different regimes in which the light emitted by the fluorophores/scattering medium ensemble shows either a fluorescent spectrum or a thermalized spectrum or Bose-Einstein condensation. This will be achieved by changing the density of emitters and the properties of the scattering medium. Different kind of fluorophores and scatterers will also be considered in order to efficiently reach the thermalization regime. This paves the way to new affordable light sources based on easy-to-fabricate scattering materials.
Contact
Valentina Krachmalnicoff
17/10/2023
/
Thesis :
Funding :
103
Autonomous quantum error correction by inelastic Cooper-pair tunneling
Domaines
Quantum Machines
Quantum information theory and quantum technologies
Quantum optics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Non-linear optics
Type of internship
Expérimental et théorique Description
Cat codes offer a very promising path towards the full quantum error correction of quantum processors based on superconducting circuits. Our group, in collaboration with Alice&Bob, demonstrated autonomous correction protocols based on Josephson junctions. The intern will take part in our group’s ongoing effort to develop new cat-code paradigms, by studying a circuit that utilizes an original mechanism to stabilize a cat-qubit. This new mechanism makes use of the steady flow of Cooper pairs against a dc-voltage to power up an interaction between two superconducting resonators which effectively protect the cat-qubit against errors. It is predicted to yield a much larger error correction rate than current implementations, which directly translates into longer quantum processing time.
The intern will work within the framework of the RobustSuperQ PEPR (part of the French Quantum Plan) which aims at accelerating French R&D on superconducting qubits protected against decoherence. The project takes place in collaboration with Alice and Bob as well as with the theory group of Ulm University.
Contact
Benjamin Huard
Laboratory : laboratoire de physique, ENS de Lyon - umr 5672
Team : ENS de Lyon, Physique
Team Website
Team : ENS de Lyon, Physique
Team Website
17/10/2023
/
Thesis :
Funding :
104
Improving coherence times and residual excitation of superconducting quantum circuits using thermodynamics at the mesoscopic scale
Domaines
Condensed matter
Quantum information theory and quantum technologies
Type of internship
Expérimental et théorique Description
While commercial dilution refrigerators offer a base plate at less than 10 mK, thermalizing the microwave modes themselves turns out to be more challenging than just anchoring the superconducting circuit to the plate. Effectively, superconducting qubits are coupled to a heat bath that is often in the 50-100 mK range, which drastically downgrades their coherence time. A key element to getting lower effective temperatures is the microwave attenuator that is the closest to the quantum circuit. Recent progress has been made by a couple of companies using conductive casing (gold coated copper) instead of stainless steel. However, the dissipative elements are thin films that are not able to evacuate Joule power (up to about 100 nW) well enough into the dilution refrigerator. This is particularly detrimental for quantum error correction or amplification, which both require strong microwave drives. The project consists of removing this current bottleneck by designing, fabricating, and testing better attenuators for superconducting quantum circuits.
Contact
Benjamin Huard
Laboratory : laboratoire de physique, ENS de Lyon - umr 5672
Team : ENS de Lyon, Physique
Team Website
Team : ENS de Lyon, Physique
Team Website
17/10/2023
/
Thesis :
Funding :
105
Delta Kick Squeezing for Atom Interferometry beyond the Standard Quantum Limit
Domaines
Quantum optics/Atomic physics/Laser
Quantum gases
Type of internship
Expérimental Description
The aim of this intership is the implementation of the "Delta-Kick squeezing" (DKS) technique, recently proposed. This DKS rely on the engineering of atom atom interactions in a BEC in free fall. Such interactions induce strong correlations between the atoms, and lead to squeezing in the population difference between the two interferometer paths, and is thus a promising route we want to explore for reaching phase sensitivity below the standard quantum limit.
Contact
Franck Pereira dos Santos
17/10/2023
/
Thesis :
Funding :
106
SPIN SCANNING PROBE USING QUANTUM MICROWAVES
Domaines
Condensed matter
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Type of internship
Expérimental Description
Electron paramagnetic resonance (EPR) is a powerful spectroscopy method which can identify spins and paramagnetic species and quantify their interactions with their environment. Because of the weak spin-microwave coupling, conventional EPR spectroscopy has a low sensitivity which limits its use to samples of macroscopic size. Recent experiments demonstrated that superconducting quantum circuits have the potential to drastically enhance the spin detection sensitivity down to the detection of single spins within a 1 um volume probe using properties unique to quantum mechanics. However, these demonstrations have so far been done using well-known model spin systems and in restrictive conditions: very narrow spin and detector linewidths, low microwave losses, and implanted spin species. The internship project will center on developing and building a scanning probe allowing to perform EPR spectroscopy and imaging on a nearby surface with a resolution of a few spins.
Contact
Audrey Bienfait
Laboratory : laboratoire de physique, ENS de Lyon - umr 5672
Team : ENS de Lyon, Physique
Team Website
Team : ENS de Lyon, Physique
Team Website
17/10/2023
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Thesis :
Funding :
107
Interaction control in coupled two-component condensates
Domaines
Low dimension physics
Quantum gases
Type of internship
Expérimental Description
Recently, we work with an innovative method to control interparticle interaction. More precisely the method is based on a condensate in a dressed state composed of two spin states that are coherently coupled through a radio-frequency. It not only permits the control of the two-body interaction but also introduces three-body interactions (PRL 128, 083401 (2022)). Three-body interactions can be made to play a dominant role in the condensate dynamics. We have for example observed the collapse of the Bose-Einstein condensate induced by these interactions.
In the context of a M2 internship, we propose to develop another tool in our setup: a Raman laser system (at 532 nm). It will permit coupling of the two spin states through a two-photon optical transition. This has the advantage to allow to work at large magnetic field where the two spin states of interest are not coupled by a radio-frequency and where the transition is less magnetic field sensitive. Second, lasers can be spatially patterned and the coupling can be made position dependent, allowing a position dependent interaction. Finally, this opens the possibility of momentum dependent coupling if the two Raman beams are not copropagating. This leads to velocity dependent interaction and to possible formation of a supersolid phase. The internship could continue with a PhD on interaction control using Raman coupled two-component condensates.
Contact
Thomas Bourdel
16/10/2023
/
Thesis :
Funding :
108
Engineering programmable atomic structures for quantum simulations
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Quantum gases
Type of internship
Expérimental Contact
Guillaume Salomon
16/10/2023
/
Thesis :
Funding :
109
Quantum simulation with circular Rydberg atoms in optical tweezers
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Quantum gases
Type of internship
Expérimental Description
The long lifetimes and strong dipole-dipole interactions of circular Rydberg atoms make them particularly appealing for the realization of quantum simulations. Our research activities aim at aim at the operation over unprecedented times of quantum simulation of interacting spin systems with circular Rydberg atoms laser-trapped in an array of optical tweezers. The intern will participate in the transformation of the existing room-temperature setup into a cryogenic setup where we will fully benefit from the long lifetimes of circular states. We will use the new setup to demonstrate quantum simulations in a subsequent doctoral work.
Contact
Clément Sayrin
16/10/2023
/
Thesis :
Funding :
110
Inhibition of spontaneous emission of trapped Rydberg atoms
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Type of internship
Expérimental Description
The current ultimate goal of the group is the realization of a novel quantum simulator platform based on a chain of circular Rydberg atoms and its benchmarking by the exploration of the phase diagram of a 1D spin chain, proposed in Phys.Rev.X 8, 011032 (2018). Despite long intrinsic lifetime of these atoms (several tens of milliseconds), the lifetime of a chain of N atoms scales as 1/N, significantly limiting the possible use of these arrays for long and sophisticated quantum simulations. We aim to protect atoms from spontaneous emission, limiting their lifetimes, by placing them inside a specially designed electrode structure where the spontaneous emission is strongly inhibited by properly shaping vacuum modes. The current experimental setup is under construction. The goal of the internship is to realize and characterize the trapping and protection of single atoms inside this structure. The internship may be continued into a PhD in Toulouse, where the experimental setup will be moved in July 2023.
Contact
Igor Dotsenko
16/10/2023
/
Thesis :
Funding :
111
Mimicking photosynthesis for room-temperature quantum optics and optimized energy conversion
Domaines
Quantum optics/Atomic physics/Laser
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
In order to maximize the absorption and harvesting of photons towards photochemical reaction centres capable of splitting water into chemical fuels, Nature has performed an impressive quantum engineering of photosynthetic pigments, also called light harvesting complexes (LHCs). In these complex 3D arrangements of chlorophyll and carotenoid molecules, templated by proteins, quantum transition dipoles are coherently coupled in a strong coupling regime leading to optimized absorption cross-sections and allowing spectral tuning covering the red to near-infrared range. The aim of this project is to develop a new family of biomimetic photosynthetic pigments by substituting the protein template of LHCs with an artificial DNA nanostructure (also called DNA origami) and the chlorophyll molecules by synthetic cyanine dyes. The biomimetic molecular aggregates willbe used as new building blocks for artificial photosynthetic systems in which energy harvesting is optimized over the entire visible range but also optimized quantum emitters for coherent light-matter interactions at room temperature when coupled to an optical resonator.
Contact
Sébastien Bidault
13/10/2023
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Thesis :
Funding :
112
Optical probe of Moiré engineered 2D superconducting materials
Domaines
Condensed matter
Nouveaux états électroniques de la matière corrélée
Quantum information theory and quantum technologies
Non-linear optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Transition metal dichalcogenides (TMDs) have recently attracted significant interest because they allow the exploration of novel quantum phenomena down to the 2D limit. Of particular interest for the present project are metallic TMD like NbSe2 which displays various quantum phases like Superconductivity (SC) and charge density wave (CDW) states. In addition, the possibility of creating Van der Waals heterostructures (VdW) by vertically stacking 2D materials provide a fertile playground to engineer novel properties and devicese . Indeed, quantum interference effects between sheets of the 2D TMD with a twist angle allows an unprecedented control of the effective electron kinetic energy scale, driving the system to an interaction dominated regime and drastically enhancing anisotropies, thus providing a pathway to engineer SC properties at the 2D scale.
During the internship, the student will initiate the fabrication of TMD-based VdW heterostructures displaying SC properties using exfoliation techniques. Samples of NbSe2 will be fabricated and characterized as a function of thickness and twist angle. The obtained samples will be first measured by transport measurements to assess their presence of SC and its critical temperature. Low temperature spectroscopic techniques with micron-size spatial resolution like Raman scattering will then be used to probe the SC state .
Contact
Yann Gallais
13/10/2023
/
Thesis :
Funding :
113
Cavity Higgs polaritons in 2D superconducting materials
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Nouveaux états électroniques de la matière corrélée
Quantum information theory and quantum technologies
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Non-linear optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Thanks to strong light-matter interactions in cavity-coupled systems, new important vacuum phenomena are emerging in condensed matter physics. In analogy with exciton- and phonon-polaritons that are now routinely observed in semiconductors an exciting perspective is to tune or even enhance the properties of a superconductor (SC) at equilibrium by dressing it with vacuum photons. Beyond static properties such as enhancing the SC transition temperature, of particular interest is the possibility to directly couple the SC Higgs mode, a superconducting analogue of the Higgs boson well-known from high-energy physics, to a THz cavity mode. In this setting a new hybrid light-matter excitation coined the Higgs polariton is formed.
2D SC transition metal dichalcogenides (TMDs) like NbSe2, and NbS2 are extremely attractive platforms to demonstrate these effects. Their 2D nature make them particularly suitable for integrating into deep sub-wavelength THz cavities based on split-ring resonators which have been used successfully to produce strong light-matter polariton state in semiconductor heterostructures. During this internship, the fabrication of TMD-based van der Waals heterostructure will be carried out and integrated into THz split resonant cavities. We will then spectroscopic fingerprints of the Higgs polariton via Raman and THz spectroscopic techniques. The work will be performed in close collaboration with THz cavity experts at the LSI lab of Ecole Polytechnique.
Contact
Yann Gallais
13/10/2023
/
Thesis :
Funding :
114
Spin mechanics with trapped diamonds
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Quantum Machines
Quantum optics
Non-linear optics
Type of internship
Expérimental et théorique Description
Experiments on trapping particles containing atoms with a spin degree of freedom have shown remarkable progress in recent years. In our team, we have developed a micro-electrostatic trap for diamond particles containing defects whose spin can be coherently polarized and manipulated with microwaves. These defects are molecular systems consisting in the association of a nitrogen atom and a vacancy (NV center). Thanks to a coupling mechanism of the spin of the NV centers in the diamond with the oscillation of the diamond in the trap, we have been able to demonstrate an efficient cooling mechanism of the angular motion of the latter.
It is in fact theoretically possible to control this motion until it is cooled to the ground state of the harmonic oscillator. The objective of the internship (and later of the thesis) will be to levitate ultra-pure diamond particles and employ instead the coupling of the motion to nuclear spins to move towards this regime.
Contact
Gabriel Hétet
13/10/2023
/
Thesis :
Funding :
115
Digital holography in non-linear regime for the investigation of nanostructures
Domaines
Condensed matter
Biophysics
Non-linear optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
We propose to pursue the development of a harmonic holographic microscope for single-shot mapping of the second harmonic 3D radiation pattern near samples with nonzero second harmonic susceptibilities. The knowledge of the scattered field (amplitude and phase) in a given plane (that of a camera) allows its reconstruction in any other plane using e.g. the angular spectrum representation of optical fields, and assuming propagation in homogeneous media. The training will be performed under supervision of Yannick De Wilde (CNRS Research Director at Institut Langevin scientist) and co-supervision of his PhD student Serena Goldmann and our collaborator Gilles Tessier (Professor at Sorbonne University). We plan to continue it with a thesis.
Contact
Yannick DE WILDE
12/10/2023
/
Thesis :
Funding :
116
Collective spontaneous emission in arrays of single Dy atoms
Domaines
Quantum optics/Atomic physics/Laser
Quantum optics
Quantum gases
Type of internship
Expérimental Description
This project takes place on a new experimental platform producing arrays of single dysprosium atoms. The goal of the project is to study and control collective spontaneous emission and subradiance in an ensemble of two-level atoms, benefiting from the specificities of the atomic structure of Dy. Here, the interaction will be the resonant dipole interaction that exists between atoms driven by resonant light, which exhibits both a real and imaginary part. The exchange of excitation that results from the interaction naturally implements an interacting spin system where the two atomic states are mapped onto the two states of a spin-1⁄2. The imaginary part modifies spontaneous emission and can lead to a strong increase of the lifetime of the ensemble: subradiance. To reach strong interaction effects, the interparticle distance must be shorter than the wavelength of the transition between the two levels.
We currently run a new experimental setup for cooling and trapping Dy. It will allow to obtain sub-λ/2 spacing and enable probing and addressing at the single atom level. The experiment produces configurable arrays of Dy atoms in optical tweezers (see figure). In the internship we propose, we will implement the next step which is to transfer the atoms in an optical lattice with variable spacing to reach the sub-λ/2 regime. This Master 2 internship will be followed by a funded PhD pursuing the first studies of collective spontaneous emission in such arrays.
Contact
Igor Ferrier-Barbut
12/10/2023
/
Thesis :
Funding :
117
Large Continuous Variable quantum networks for quantum information technologies
Domaines
Quantum information theory and quantum technologies
Quantum optics
Non-linear optics
Type of internship
Expérimental Description
Photonics quantum networks are essential resources for quantum communication and information protocols, they represent an essential part of the future quantum internet where quantum states of light will allow for the efficient distribution and manipulation of information. We explore continuous-variable (CV) entangled states, where entanglement correlations appear between quadratures of the electromagnetic field. Such states can be deterministically generated by mixing several squeezed optical modes via linear-optics operations or, more generally, via mode-basis changes. We recently demonstrated the generation of spectrally multimode squeeze states of light at telecommunication wavelengths involving more that 21 frequency modes [1]. The generated resource can then be used for frequency multiplexed cryptographic protocols [2]. Moreover, by exploiting temporal multiplexing, large three-dimensional structures, necessary for fault tolerant quantum computing [4] can then be explored along with non-Gaussian operations [5] for quantum information protocols. The internship may concern the temporal multiplexing via pulse-resolved homodyne detector, and/or the design of non-Gaussian operations (like single-photon subtraction) via photon counting with nanowire detectors. The project fits with the purposes of ERC project COCQOoN, the national acceleration strategy PEPR OQULUS ( ‘ordinateur quantique à base de lumière en variables discrètes et continues’) and the EU projet veriqub.
Contact
Valentina Parigi
12/10/2023
/
Thesis :
Funding :
118
Hidden variable models for simulating optical quantum computing
Domaines
Quantum optics/Atomic physics/Laser
Quantum Machines
Quantum information theory and quantum technologies
Quantum optics
Type of internship
Théorique, numérique Description
Sampling problems are of crucial importance for demonstrating the quantum devices can efficiently perform tasks that no classical computer can efficiently simulate. Various groups have claimed the realisations of such so-called quantum advantages, but many of these experiments have ultimately been simulated on classical computers by exploiting experimental imperfections. This clearly shows the difficulty of translating highly idealised theoretical protocols to real experiments.
In this internship, we will actively develop techniques to simulate optical sampling problems based on phase space representations of the quantum states, quantum operations, and quantum measurements. These phase space techniques are useful to explicitly construct hidden variable models for sampling problems. We will investigate which physical properties hinder us from using such hidden variables to efficiently simulate a sampling problem on a classical computer. In the past this approach was used to identify Wigner negativity as a required physical property [1]. However, other methods have recently emphasised the role of other physical properties [2].
The goal of this internship is to either identify new necessary properties or acquire a better understanding of how the different known properties combine to make the sampling problem hard to simulate.
[1] Mari and Eisert, Phys. Rev. Lett. 109, 230503 (2012).
[2] Chabaud and Walschaers Phys. Rev. Lett. 130, 090602 (2023).
Contact
Mattia Walschaers
12/10/2023
/
Thesis :
Funding :
119
Nano-imaging of non-Fourier heat flow
Domaines
Condensed matter
Hydrodynamics/Turbulence/Fluid mechanics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Efficient heat management is critical for the optimal performance and energy consumption of modern-day electronics. While Fourier’s macroscopic model for heat diffusion has been a valuable tool for homogeneous solids at room temperature, it falls short in describing heat propagation accurately under certain conditions. This PhD project aims to quantitatively investigate scenarios where the Fourier model breaks down and work towards developing a more physically satisfying model of heat propagation. In particular, this project will focus on the phonon viscous hydrodynamic transport regime that has recently attracted considerable interest in the scientific community. It is a regime that is neither ballistic nor diffusive and emerges when quasi-particles interact strongly with each other without loosing momentum.
The goal of this PhD will be to build a very sensitive and local thermometer (based on SQUID technology) so as to map out the temperature distribution at a few tens of nm to look for signatures of this non-Fourier like behaviour.
As a PhD researcher, you will participate in the design, construction and operation of the SQUID based microscope. Enthusiasm for instrumentation is necessary.
The PhD can be funded for 3 years, starting in Fall 2024 (no later than 01/11/2024).
Applications are accepted on an ongoing basis until the position is filled.
Contact
Arthur Marguerite
12/10/2023
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Thesis :
Funding :
120
THz quantum devices based on graphene quantum dots coupled to a resonator
Domaines
Condensed matter
Low dimension physics
Quantum optics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Non-linear optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Exploiting quantum technologies in the terahertz (THz) spectral range could have a number of benefits, but THz quantum systems are fairly unexplored due to the relative immaturity of THz technology compared to microwave and optical counterparts. The aim of the internship is to explore novel THz quantum devices based on graphene quantum dots coupled to a THz resonator under different coupling regimes, from weak to ultra-strong.
Contact
Juliette MANGENEY
12/10/2023
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Thesis :
Funding :
121
Quantum Information and Entanglement in Correlated Quantum Matter
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Non-equilibrium Statistical Physics
Quantum gases
Type of internship
Théorique, numérique Description
We are only a the beginning of understanding the close relationship between quantum information and correlated quantum matter, for instance on emerging phenomena such as phase transitions. Another equally fundamental question is to understand how information propagates in correlated quantum systems, with applications of prime importance not only for quantum communications, but also for the foundations of statistical physics and the ergodicity of isolated systems. The study of these questions is particularly suited to close collaboration between theory and experiments realized out on new quantum control devices.
This project aims to explore two aspects of these questions:
(i) The role of entanglement in quantum phase transitions;
(ii) The propagation of information in correlated quantum systems.
Contact
Laurent SANCHEZ-PALENCIA
11/10/2023
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Thesis :
Funding :
122
Atomic-scale quantum photonics of moiré superlattices
Domaines
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
This M2/PhD project aims to undertsand and control quantum light-matter interactions in twisted 2D layers with nanometer-scale spatial resolution.
Contact
Stéphane Berciaud
Laboratory : IPCMS (Strasbourg) - UMR 75 04
Team : Nano Optics and Low Dimensional Materials
Team Website
Team : Nano Optics and Low Dimensional Materials
Team Website
11/10/2023
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Thesis :
Funding :
123
Topological states of matter with atomic Dysprosium
Domaines
Quantum gases
Type of internship
Expérimental Description
Our experimental team works on ultracold gases of Dysprosium atoms. We aim at realizing atomic instances of topological states of matter. The specificity of our setup is the ability to strongly couple the atomic spin to the motion of atoms, leading to effective magnetic fields. We have recently demonstrated quantum Hall physics based on these techniques, and we plan to investigate various types of topological states of matter in this structure
Contact
Sylvain Nascimbene
11/10/2023
/
Thesis :
Funding :
124
Atom chip technology for quantum gravity sensing
Domaines
Quantum optics/Atomic physics/Laser
Type of internship
Expérimental Contact
Leonid Sidorenkov
10/10/2023
/
Thesis :
Funding :
125
Quantum sensing of the gravity field
Domaines
Quantum optics/Atomic physics/Laser
Type of internship
Expérimental Contact
Leonid Sidorenkov
10/10/2023
/
Thesis :
Funding :
126
Mixed dimensions van der Waals hetero-structures as a plateform for quantum photonics
Domaines
Condensed matter
Type of internship
Expérimental Description
Encapsulating carbon nano-structures in 2D layered materials can help control their coherence properties (dephasing, spectral diffusion...) using the unique atomically clean environment achieved with table-top setups in van der Waals hetero-structures. The electronic states and quantum photo-physical properties of the emitters will be investigate using photoluminescence spectroscopy at the single molecule level,. Gating approaches will be developped to reach the lifetime limited dephasing regime where quantum coherence can be fully exploited.
Contact
Christophe Voisin
10/10/2023
/
Thesis :
Funding :
127
Deep sub-wavelength dielectric cavities coupled to nano-emitters in the cavity quantum electrodynamics regime.
Domaines
Quantum optics
Type of internship
Expérimental Description
Designing dielectric nano-antenna to reach deep subwavelength light confinment to enhance light-matter coupling with a signle nano-emitter for quantum technologies applications.
Contact
Christophe Voisin
10/10/2023
/
Thesis :
Funding :
128
Unveil thermoelectric properties of 2D In2Se3
Domaines
Condensed matter
Low dimension physics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Recently bidimensional (2D) van der Waals (vdW) III−VI semiconductors have drawn intense attention due to their unique electronic properties. Among these materials, In2Se3 in its most studied alpha and beta phases, shows a great potential for a wide variety of applications in electronics, photonics and even thermoelectricity, due to its good mobility, excellent photoresponsivity, exotic ferroelectricity, and unique band structure. In2Se3 possess an in- and out-of-plane ferroelectricity, which remains robust down to the monolayer limit. Very recently, 2H alpha-In2Se3 single crystals have also shown the occurrence of a 2D electron gas (2DEG) at their surface.
In this context, the main goal of the internship is to go a step forward in the investigation of the thermoelectric properties of alpha-In2Se3 and the influence of the 2DEG formed at its surface on the electric and thermoelectric response.
Contact
Maria Luisa Della Rocca
10/10/2023
/
Thesis :
Funding :
129
Graphene nanostructuring for energy conversion at nanoscale
Domaines
Condensed matter
Low dimension physics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Research on new thermoelectric (TE) devices and materials for thermal management at nanoscale is highly demanded in nanoelectronics. In particular, energy conversion of TE nanogenerators aims to recover waste heat in nanoelectronics, improving device performances.
In this context, the discovery of 2D materials has open new routes of investigation, high efficiencies have been predicted in graphene nanostructures and transition metal dicalcogenides (TMD).
The main goal of the internship is to experimentally investigate the electric, thermoelectric and thermal properties of devices based on nanostructured graphene. Nanostructuring will be engineered by a network of holes, aiming to reduce the phonon mean free path without affecting significantly the electron mean free path.
Contact
Maria Luisa Della Rocca
10/10/2023
/
Thesis :
Funding :
130
Innovate with light: Quantum imaging, microscopy and beyond
Domaines
Quantum optics
Type of internship
Expérimental Description
Join our team as we strive to develop tomorrow’s quantum microscope! Leveraging the non-classical properties of light, such as entanglement – a topic recently honoured with the Nobel Prize in Physics in 2022, we aim to push the boundaries of classical imaging by developing innovative quantum experimental protocols. In addition, we use these tools to study and understand the mysterious properties of quantum light. We are currently seeking a highly motivated M2 intern student to join our team with the goal of pursuing a PhD after. A passion for physics, a problem-solving mindset, and a strong team spirit are essential attributes for the successful candidate. We have several internship projects available for prospective candidates:
(i) Building a practical quantum phase microscope based on entangled photons (Applied optics)
(ii) Developing a non-local imaging protocol for imaging through scattering using entanglement (Applied to Fundamental)
(iii) Deciphering high-dimensional entanglement with cameras (Fundamental)
Each project is based on ongoing experiments within the team. While a solid theoretical understanding is beneficial, the primary emphasis is on the experimental component. The specific project will be determined during interviews, considering the team's needs and the candidate's preferences. It's worth noting that the internship project's subject may or may not align with the subsequent thesis topic
Contact
Hugo Defienne
10/10/2023
/
Thesis :
Funding :
131
Time-frequency quantum information processing
Domaines
Quantum optics
Type of internship
Théorique, numérique Description
The frequency degree of freedom of a single photon represents a continuous variable that serves as a powerful tool for encoding quantum information. It provides a high-dimensional encoding scheme, which in turn helps to reduce overall optical costs. Leveraging frequency as a continuous variable and subsequently discretizing it allows for the creation of qubits, which are essential for achieving fault-tolerance. These qubits demonstrate robustness against temporal or spectral broadening for the superposition of two frequency and time, and even small broadening in both the temporal and frequency domains, as for the time-frequency Gottesman–Kitaev–Preskill (GKP) states (Phys. Rev. A 102, 012607). Errors can arise during the manipulation of single photons in logical operations and as they propagate through optical fibers. What we will explore in this internship i the propagation of single photons with diverse spectral distributions through optical fibers. We will investigate the use of time-frequency GKP states and two-color (time-of-arrival) encoding schemes. We will then model and analyze noise that may affect these quantum states during their propagation, and will simulate light-matter interactions and implement computational methods/ Finally, the use of these time-frequency encodings for different quantum communication protocols will be investigated.
Contact
Nicolas Fabre
10/10/2023
/
Thesis :
Funding :
132
Magnetic interactions and textures in 2D ferromgnetic systems
Domaines
Low dimension physics
Type of internship
Expérimental Contact
Alexandra MOUGIN
09/10/2023
/
Thesis :
Funding :
133
Theoretical Investigation of Topological Insulators for Thermoelectric Applications
Domaines
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Type of internship
Théorique, numérique Description
Technologies harnessing solar and thermal energies are promising avenues that could help achieving sustainable and alternative energy sources. However, it is essential to find suitable materials and then evaluate their performance by simulating them from the material to the device level, offering a fast
and inexpensive way to check device designs and processes. Topological insulators (TIs), possess novel, symmetry-protected electronic and optical properties (e.g. long-lifetime quasi-particles with decoherence-free internal states) that make them promising candidates as future highly efficient quantum materials for energy conversion.
By exploiting first-principles simulation techniques from theoretical physics and chemistry, this master project aims at understanding the correlation between the topology of electrons/phonons, low dimensionality of materials and their applications in the field of thermoelectricity (i.e. direct conversion of thermal flow into electric current) and to propose new interesting materials.
As a matter of fact, TIs exhibit intrinsic properties that are “topologically protected”, allowing electrons not to suffer from backscattering due to impurities and defects (unlike phonons). This allows for efficient decoupling of the two types of transport and thus an independent way for a simultaneous optimization of the electronic and thermal conductivity, which can also be improved by reducing the dimensionality of the system.
Contact
Davide Romanin
09/10/2023
/
Thesis :
Funding :
134
Theoretical Investigation of Topologically Insulating Polymers for Energy Applications
Domaines
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Type of internship
Théorique, numérique Description
Generally speaking, π-conjugated organic semiconductors form a highly versatile class of materials with tremendous promise for the development of cheap, flexible and non-toxic optoelectronic devices such as photovoltaics, sensors and solid state lighting.
One of the ultimate frontiers in energy conversion and storage from light-matter interactions is to
create long-lived excitonic quasiparticles (bound electron-hole states in semiconductors).
Topological insulators represent an ideal platform for this, as they show correlations between spatial
separation and topological surface states.
Experimental evidence for a topological (Z2) phase transition has recently been presented in a series of 1D polyacene polymers, representing a physical realisation of the well known Su-Schrieffer-Heeger
(SSH) model.
The student will rationalise an analytical effective model by calculating the topological invariants of different bridged configurations through an-initio computational techniques. After that we will select the suitable candidates (at least 2, one trivial and one non trivial topological phase for the master student) for the computation of the optical properties, i.e. with quasi-particle band gaps and excitons via many-body theoretical techniques.
Contact
Davide Romanin
09/10/2023
/
Thesis :
Funding :
135
Emergent quantum computation from the dynamics of complex systems
Domaines
Quantum information theory and quantum technologies
Type of internship
Théorique, numérique Description
Investigating innovative approaches to analog computing through harnessing the emerging dynamics of quantum systems represents an exciting and contemporary frontier. This endeavor carries the potential to transform domains like optimization, machine learning, and simulations by adeptly addressing challenging problems that classical computers struggle with. It introduces a fresh computational paradigm applicable to fields such as optimization, artificial intelligence, and scientific simulations, thereby holding the promise of enhancing the efficiency and effectiveness of solving intricate real-world problems.
During this theoretical internship, the Master student will learn, generalize and employ methods developed in recent and promising works to delve into innovative and advanced strategies for harnessing the intricacies of quantum systems. Our goal is to develop emergent computational capabilities, particularly geared towards solving optimization problems and addressing interdisciplinary challenges. The internship's theoretical research will encompass both analytical and numerical methods, with a specific focus on quantum many-body physics of state-of-the-art quantum platforms based on superconducting quantum circuits and other quantum systems.
Contact
Cristiano Ciuti
09/10/2023
/
Thesis :
Funding :
136
Ultra-Low power semiconductor saturable absorber mirrors in the mid-IR
Domaines
Non-linear optics
Type of internship
Expérimental et théorique Description
The goal of this internship is to demonstrate ultra-low power nonlinear mirrors in the mid-IR, supported by the recent results obtained by the host team [1,2]. The experiments will be performed by optical pumping with a tunable, commercial QCL and - time permitting - with an ultra-fast mid-IR OPO.
[1] M. Jeannin, JM Manceau, R. Colombelli, Phys. Rev. Lett 127, 187401 (2021)
[2] M. Jeannin, E. Cosentino, et al., Appl. Phys. Lett. 122, 241107 (2023).
Contact
Raffaele Colombelli
09/10/2023
/
Thesis :
Funding :
137
Exploring topological quantum conductors made of cavity quantum materials
Domaines
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Type of internship
Théorique, numérique Description
Recently, we demonstrated the profound impact that the interaction between cavity quantum electromagnetic fields and topological quantum materials, such as quantum Hall systems and 2D moiré materials, can have on their quantum transport and topological properties. In this theoretical internship, the Master's student will learn, develop and employ cutting-edge theoretical techniques of quantum many-body physics and cavity Quantum Electrodynamics (QED) in order to investigate the quantum transport of novel emerging topological cavity quantum materials.
Contact
Cristiano Ciuti
09/10/2023
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Thesis :
Funding :
138
Theory and simulation of secure delegated quantum computation protocol in a network perspective
Domaines
Quantum information theory and quantum technologies
Type of internship
Théorique, numérique Description
Within the development of quantum technologies, secure delegated quantum computing stands out as a promising application. This internship aims at theoretically investigating the experimental implementation of the robust, verifiable and blind delegated quantum computation protocol within the Quantum Internet Alliance (QIA) European project and analyse possible setup and protocol modifications.
Contact
Maxime Garnier
09/10/2023
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Thesis :
Funding :
139
Growth and spintronics of low symmetry magnetic layers
Domaines
Condensed matter
Type of internship
Expérimental et théorique Description
The goal of this internship is to realize ultrathin films of metallic and magnetic layers on insulating substrates of very low symmetry. The samples will be made in the clean room of the Matériaux et Phénomènes Quantiques lab in Paris and characterized by x-ray diffraction and vibrating sample magnetometry or magneto-optical effects for their magnetic properties. The second part of the internship will be to achieve lithography and electronic transport measurements on those samples for magnetic memory applications. This part will be done in part in Singapore, in collaboration with Pr. Yang's group, at the Computer and Electrical Engineering departement of the National University of Singapore.
Contact
Vincent Repain
09/10/2023
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Thesis :
Funding :