Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 79: Superconductivity: Superconducting Electronics - Circuit QED

TT 79.12: Talk

Thursday, March 15, 2018, 12:30–12:45, H 2053

Quasiparticle dynamics in Andreev quantum dots — •Leandro Tosi, Marcelo Goffman, Cristian Urbina, and Hugues Pothier — Quantronics group, SPEC, CEA Saclay, France

In contrast with a bulk superconductor, a single-channel phase-biased superconducting weak link hosts a discrete subgap quasiparticle state, called "Andreev state". It can be seen as a sort of quantum dot in which zero, one or two quasiparticles can be trapped, not due to electrostatic barriers, but to the phase drop. This "Andreev quantum dot" constitutes a very simple playground to explore the foundations of mesoscopic superconductivity.

I will present experiments on Andreev quantum dots obtained at one-atom contacts between aluminum electrodes, in which we probe the dynamics of quasiparticles trapping and un-trapping using circuit-QED like techniques [1]. I will focus in particular on the effect of the cavity on this dynamics.
C. Janvier et al., Science 349, 1199 (2015)