Superconducting atomic contacts inductively coupled to a microwave resonator

C F Janvier (1) , L Tosi (2) , Ç. Ö. Girit (1) , M.F. Goffman (1) , Hugues Pothier (1) , Christian F Urbina (1)

1 QUANTRONICS - Quantronics Group
2 Instituto Balseiro [Bariloche]

We describe and characterize a microwave setup to probe the Andreev levels of a superconducting atomic contact. The contact is part of a superconducting loop inductively coupled to a superconducting coplanar resonator. By monitoring the resonator reflection coefficient close to its resonance frequency as a function of both flux through the loop and frequency of a second tone we perform spectroscopy of the transition between two Andreev levels of highly transmitting channels of the contact. The results indicate how to perform coherent manipulation of these states.

Keywords: break junctions; atomic contacts; superconductivity; Josephson effect; Andreev states

Domains: Physics [physics]

C F Janvier, L Tosi, Ç. Ö. Girit, M.F. Goffman, Hugues Pothier, et al.. Superconducting atomic contacts inductively coupled to a microwave resonator. Journal of Physics: Condensed Matter, 2014, 26, pp.474208. ⟨10.1088/0953-8984/26/47/474208⟩. ⟨cea-01384806⟩