Théorique, numérique
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.