Hybrid Quantum Circuits

This HDR thesis mainly focuses on the work that I have performed since my arrival at the Laboratoire Pierre Aigrain of ENS-Paris, for the development of Mesoscopic Quantum Electrodynamics (or Cavity Quantum Electrodynamics with hybrid nanocircuits), in close collaboration with the experimental "Hybrid Quantum Circuits" team. The first experimental results of this collaboration include the observation of a coherent spin/photon coupling at the single spin level [Science 349, 6246 (2015)] and photon-emission by a quantum dot/superconductor junction [Phys. Rev. X, 6, 021014 (2016)]. I also describe more formal work on the general theoretical description of Mesoscopic Quantum Electrodynamics