Coherent single-electron transport in hybrid superconductor-semiconductor Coulomb islands

ORAL

Abstract

The spatial separation of Majorana modes is expected to allow coherent transport of single electrons through a Coulomb blockaded one-dimensional topological superconductor [1]. Here we investigate phase coherent transport in a hybrid Al-InAs Coulomb island embedded in an Aharonov-Bohm interferometer. When a magnetic field is applied, the energy of a discrete sub-gap state is lowered below the charging energy and conductance oscillations are observed with a magnetic flux period of h/e (h is the Planck constant and e is the elementary charge), which indicates coherent transport of single electrons. The oscillation amplitude is maximized when the Coulomb peaks are 1 electron (1e) periodic, while the interference signal is suppressed when transport is 2e periodic or the island is in the normal state. The observation of phase-coherent transport enables us to investigate the coupling of Majorana modes from two separated topological wires with the goal of creating a topological qubit.

[1] Fu, L. Phys. Rev. Lett. 104, 056402 (2010)

*This research was supported by Microsoft, and the Danish National Research Foundation

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Presenters

  • Alexander Whiticar

    • Center for Quantum Devices, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Center for Quantum Devices and Station Q Copenhagen, University of Copenhagen

Authors

  • Alexander Whiticar

    • Center for Quantum Devices, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Center for Quantum Devices and Station Q Copenhagen, University of Copenhagen

  • Antonio Fornieri

    • Center for Quantum Devices, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Center for Quantum Devices and Station Q Copenhagen, University of Copenhagen

  • Eoin C O'Farrell

    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Center for Quantum Devices, Niels Bohr Institute
    • University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, University of Copenhagen

  • Asbjorn C. C. Drachmann

    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Center for Quantum Devices and Station Q Copenhagen, University of Copenhagen

  • Tian Wang

    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907 USA
    • Microsoft Station Q Purdue
    • Birck Nanotechnology Center, Purdue University

  • Candice Thomas

    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907 USA
    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
    • Department of Physics and Astronomy, Station Q Purdue, and Birck Nanotechnology Center, Purdue University

  • Sergei Gronin

    • Microsoft
    • Microsoft Quantum at Station Q Purdue, Purdue University
    • Department of Physics and Astronomy, Purdue University
    • Microsoft Quantum at Station Q Purdue, Purdue University, West Lafayette, Indiana 47907, USA
    • Microsoft Station Q Purdue
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University

  • Geoffrey Gardner

    • Department of Physics and Astronomy, Purdue University
    • Purdue University
    • Birck Nano Technology Center, Purdue University
    • Dept. of Physics, Purdue University
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy, Station Q Purdue, and Birck Nanotechnology Center, Purdue University

  • Michael Manfra

    • Purdue University
    • Microsoft
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907 USA
    • Microsoft Station Q Purdue
    • Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy, School of Materials Engineering and School of Electrical and Computer Engineering, Purdue University
    • Station Q Purdue and Department of Physics and Astronomy, Purdue University
    • Dept. of Physics, Purdue University
    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
    • Dept. of Physics and Astronomy, Purdue
    • Purdue University, Station Q Purdue
    • Department of Physics and Astronomy, Station Q Purdue, and Birck Nanotechnology Center, Purdue University

  • Charles M Marcus

    • Microsoft
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Center for Quantum Devices and Microsoft Quantum Lab--Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Niels Bohr Institute, University of Copenhagen
    • Niels Bohr Institute
    • Center for Quantum Devices, Niels Bohr Institute
    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
    • University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, University of Copenhagen

  • Fabrizio Nichele

    • Center for Quantum Devices, University of Copenhagen
    • IBM Research - Zurich, 8803 Rüschlikon, Switzerland
    • Center for Quantum Devices and Station Q Copenhagen, University of Copenhagen
    • IBM Zurich Research Laboratory