Freiburg 2019 – scientific programme
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FM: Fall Meeting
FM 57: Quantum Sensing: Spectroscopy I
FM 57.1: Invited Talk
Wednesday, September 25, 2019, 14:00–14:30, 2006
Probing and manipulating Andreev Bound States — •Cristian Urbina1, Leandro Tosi1, Cyril Metzger1, Marcelo F. Goffman1, Hugues Pothier1, Sunghun Park2, Alfredo Levy Yeyati2, Jesper Nygård3, and Peter Krogstrup3 — 1Quantronics Group, SPEC (CNRS), CEA-Saclay, Université Paris-Saclay, France — 2Departamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, Spain — 3Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Denmark
The quantum states on which information is stored and manipulated in currently implemented superconducting platforms correspond to bosonic electromagnetic modes of circuits made non-linear by Josephson junctions. I will present experiments on a radically different platform based on Andreev states, which are fermionic, microscopic states in superconducting weak links.
I will first present the coherent manipulation of Andreev states on a fully metallic weak link (a one-atom contact between two Al reservoirs) and then the spectroscopy of a semiconducting weak link (Al-InAs-Al) revealing a "fine structure" in the Andreev spectrum due to the strong spin-orbit coupling in InAs. Such devices could be used to coherently manipulate the spin of a single quasiparticle.