Expérimental
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.