Condensed Matter Seminar Series

Hugues Pothier

Quantronics Group,
CEA-Saclay, France


Probing and manipulating Andreev states with microwaves

Andreev states are at the basis of the description of Josephson weak links. Circuit-QED setups, which have been developed for superconducting qubits, allow detailed spectroscopy and manipulation of the Andreev states. I will present experiments performed on the simplest weak links, single atom contacts, and on InAs nanowires in which spin-orbit coupling give rise to spin-split states.


[1] “Exciting Andreev pairs in a superconducting atomic contact”, L. Bretheau, Ç. Ö. Girit, H. Pothier, D. Esteve and C. Urbina, Nature 499, 312 (2013).
[2]  “Supercurrent Spectroscopy of Andreev States”, L. Bretheau, Ç. Ö. Girit, C. Urbina, D. Esteve, and H. Pothier, Phys. Rev. X 3, 041034 (2013).
[3] “Coherent manipulation of Andreev states in superconducting atomic contacts”,  C. Janvier, L. Tosi, L. Bretheau, Ç. Ö. Girit, M. Stern, P. Bertet, P. Joyez, D. Vion, D. Esteve, M. F. Goffman, H. Pothier, and C. Urbina, Science 349, 1199 (2015). 
[4] “Spin-Orbit Splitting of Andreev States Revealed by Microwave Spectroscopy”, L. Tosi, C. Metzger, M. F. Goffman, C. Urbina, H. Pothier, Sunghun Park, A. Levy Yeyati, J. Nygård, and P. Krogstrup, Phys. Rev. X 9, 011010 (2019).