Coherent manipulation of an Andreev spin qubit
Journal article, 2021
Two promising architectures for solid-state quantum information processing are based on electron spins electrostatically confined in semiconductor quantum dots and the collective electrodynamic modes of superconducting circuits. Superconducting electrodynamic qubits involve macroscopic numbers of electrons and offer the advantage of larger coupling, whereas semiconductor spin qubits involve individual electrons trapped in microscopic volumes but are more difficult to link. We combined beneficial aspects of both platforms in the Andreev spin qubit: the spin degree of freedom of an electronic quasiparticle trapped in the supercurrent-carrying Andreev levels of a Josephson semiconductor nanowire. We performed coherent spin manipulation by combining single-shot circuit–quantum-electrodynamics readout and spin-flipping Raman transitions and found a spin-flip time TS = 17 microseconds and a spin coherence time T2E = 52 nanoseconds. These results herald a regime of supercurrent-mediated coherent spin-photon coupling at the single-quantum level.
Author
M. Hays
Yale University
V. Fatemi
Yale University
Daniël Bouman
Delft University of Technology
Kavli Institute of Nanoscience Delft
J. Cerrillo
Polytechnic University of Cartagena
Universidad Autonoma de Madrid (UAM)
S. Diamond
Yale University
K. Serniak
Yale University
T. Connolly
Yale University
P. Krogstrup
Niels Bohr Institute
J. Nygard
Niels Bohr Institute
A. Levy Yeyati
Universidad Autonoma de Madrid (UAM)
Attila Geresdi
Kavli Institute of Nanoscience Delft
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Delft University of Technology
M. H. Devoret
Yale University
Science
0036-8075 (ISSN) 1095-9203 (eISSN)
Vol. 373 6553 430-433Subject Categories
Atom and Molecular Physics and Optics
Other Physics Topics
Condensed Matter Physics
DOI
10.1126/science.abf0345