Hugues Pothier, L. Tosi, C. Metzger, M. Goffman and C. Urbina
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 state1. 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 resonator2.
This seminar is organized in the framework of the PSI2 program "Topological phases of matter: from the quantum Hall effect to spin liquids" (Topmat)