Jean-Claude Besse's research
Introduction
I work on the fabrication of superconducting circuits, modular quantum computing processors, and quantum optics in the microwave domain using artificial atoms (see About).
Major achievement 1
In my PhD work, I led the effort on the detection [1] of individual itinerant microwave photons generated by a quantum source that we also developed and characterized [2]. This work was extended to realize a parity detector, that has been used to herald propagating cat states of microwave light [3]. A clicking detector, sensitive to parity of the incoming radiation field, may prove useful in distributed error-corrected communication protocols. We have also used the same architecture to demonstrate a universal quantum gate set on itinerant microwave photons, and realized a distinct but versatile direct source of large entangled states of microwave photons in a 1D chain [5].
[1] Single photon detection
[2] Superconducting Switch
[3] Parity detection
[5] Entangled light modes
Major achievement 2
I have contributed, mostly in the nano-fabrication aspects, to a multi-year long effort geared at realizing non-local microwave quantum networks. This include the deterministic remote entanglement between superconducting qubits located physically on separated quantum devices [1], the engineering of a microwave quantum link allowing these two devices to be located in separate cryogenic systems [2], and the loophole-free experimental violation of a Bell-inequality with a solid-state sytem [3].
[3] Loophole-free Bell test
Selcted other projects
Quantum computing aspects:
Fundamental quantum optics: