Realization of an Andreev spin qubit

ORAL

Abstract

Two promising architectures for solid-state quantum information processing are electron spins trapped in semiconductor quantum dots and the collective electromagnetic modes of superconducting circuits. Here we combine these two platforms to realize the Andreev spin qubit, the residual degree of freedom of a quasiparticle trapped in the Andreev levels of a Josephson semiconductor nanowire. The interplay between the spin-orbit coupling in the semiconductor and the superconducting-phase bias results in a spin-split spectrum without an applied Zeeman field. We demonstrate coherent spin manipulation by combining single-shot circuit QED readout and spin-flipping Raman transitions in a naturally occurring Λ system formed by the two spin states and an excited state. We measure a spin-flip time TS = 17 μs and a spin coherence time T2E = 52 ns. These results herald a new spin qubit with straightforward circuit QED integration. Moreover, they further our understanding and control of Andreev levels -- the parent states of Majorana zero modes -- in semiconductor-superconductor heterostructures.

*Work supported by ARO and AFOSR

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Presenters

  • Max Hays

    • Yale University
    • Departments of Applied Physics and Physics, Yale University

Authors

  • Max Hays

    • Yale University
    • Departments of Applied Physics and Physics, Yale University

  • Valla Fatemi

    • Yale University
    • Departments of Applied Physics and Physics, Yale University

  • Daniel Bouman

    • TU Delft
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • Department of Microtechnology and Nanoscience, Chalmers University

  • Javier Cerrillo

    • Universidad Autonoma de Madrid

  • Spencer Diamond

    • TU Delft
    • Yale University
    • Departments of Applied Physics and Physics, Yale University

  • Kyle Serniak

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory
    • MIT-Lincoln Lab
    • Lincoln Laboratory, MIT
    • MIT - Lincoln Laboratory

  • Tom Connolly

    • Yale University

  • Peter Krogstrup

    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Microsoft Quantum Materials Lab and Center for Quantum Devices, Niels Bohr Institute,8University of Copenhagen, Kanalvej 7, 2800 Kongens Lyngby, Denmark
    • Niels Bohr Institute, University of Copenhagen
    • Quantum Materials Lab Copenhagen, Microsoft
    • University of Copenhagen
    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen
    • Microsoft Quantum Materials Lab, University of Copenhagen
    • Niels Bohr Institute, Copenhagen
    • Niels Bohr Institute

  • Jesper Nygard

    • University of Copenhagen
    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen

  • Alfredo Levy Yeyati

    • Universidad Autonoma de Madrid
    • Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid

  • Attila Geresdi

    • Chalmers Univ of Tech
    • Chalmers University
    • Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology
    • Department of Microtechnology and Nanoscience, Chalmers University

  • Michel Devoret

    • Yale University
    • Applied Physics Department, Yale University
    • Yale
    • Department of Applied Physics and Physics, Yale University
    • Applied Physics, Yale University
    • Departments of Applied Physics and Physics, Yale University