Coherent manipulation of Andreev states in superconducting atomic contacts

Author:

Janvier C.1,Tosi L.12,Bretheau L.1,Girit Ç. Ö.1,Stern M.1,Bertet P.1,Joyez P.1,Vion D.1,Esteve D.1,Goffman M. F.1,Pothier H.1,Urbina C.1

Affiliation:

1. Quantronics Group, Service de Physique de l’État Condensé, CNRS UMR 3680, IRAMIS, CEA-Saclay, 91191 Gif-sur-Yvette, France.

2. Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica, 8400 Bariloche, Argentina.

Abstract

Making and manipulating a weak-link qubit In superconductors, single particles cannot have energies smaller than the superconducting gap. Yet when two superconductors are separated by a thin nonsuperconducting bridge (the “weak link”), quasi-particles can occupy states that are inside the gap, the so-called Andreev bound states (ABSs). Janvier et al. fabricated such a structure out of superconducting aluminum and manipulated the occupation of a pair of ABSs. They observed oscillations in population between two of the energy levels, forming a type of qubit, which they dubbed the Andreev qubit. The results may lead to applications in quantum information processing. Science , this issue p. 1199

Funder

European Union's Seventh Framework Programme

Research Executive Agency

ECOS-SUD

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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