Collection Quantum control and feedback: foundations and applications
Organizer(s)
Date(s)
19/05/2024
Andreev states probed in a circuit-QED setup
Joint work with L. Tosi, C. Metzger, M. Goffman and C. Urbina, Quantronics group SPEC, CEA Saclay, CNRS, Université Paris-Saclay, France.
Andreev states are localized quasiparticle states that arise at phase-biased Josephson junctions. With microwaves, a Cooper pair from the superconducting condensate can be excited and create a pair of quasiparticles in an Andreev state (1). In transparent junctions, like the ones obtained in atomic contacts or nanowires, the two-level system spanned by the states with 0 and 2 quasiparticles is well decoupled from other excitations. I will report experiments in which the dynamics and the coherence of this system is probed by coupling it to a microwave resonator (2).
