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)

–

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