How to systematically map out a Majorana island

ORAL

Abstract

As a high-quality hybrid system, InSb nanowires with epitaxial-grown Al shells reveal ballistic superconductivity and quantized zero-bias conductance peak. This holds great promise for the realization of Majorana-based topological quantum computing. The building block for a topological qubit is a superconductor-semiconductor island hosting a pair of Majorana zero modes (called Majorana island). The state of the topological qubit is the combination of the even/odd parity of such Majorana islands. Therefore, to understand the status of the topological qubit, systematic studies of a Majorana island are crucial. First, by performing tunnelling spectroscopy measurements, we use the ballistic superconductivity and quantized zero-bias peak to support the high-quality and potential ‘Majorana’ properties of the island. Secondly, the even-odd ground state phase diagram as a function of chemical potential is mapped out and provides a guideline for the topological qubit. Thirdly, how the superconducting gap and effective g-factor influence the phase diagram is also studied. Such a systematic mapping of the Majorana island is also suitable for double islands, leading towards topological qubits based on multiple islands.

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Presenters

  • Jie Shen

    Delft University of Technology

Authors

  • Jie Shen

    Delft University of Technology

  • Francesco Borsoi

    Delft University of Technology, QuTech, Delft University of Technology, Delft University of Technology, QuTech

  • Sebastian Heedt

    Delft University of Technology, QuTech, Delft University of Technology

  • Bernard Van Heck

    Microsoft, Microsoft Station Q, UCSB, Microsoft Station Q, Microsoft Quantum, Station Q, Microsoft Corp, Microsoft Station Q Santa Barbara, Station Q, Microsoft Research, Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark and Microsoft Quantum, Microsoft Sta, Station Q, Microsoft

  • Sasa Gazibegovic

    Applied Physics, Eindhoven University of Technology, Eindhoven University of Technology, Applied Physics, Eindhoven Univ. of Technology, Department of Applied Physics, Eindhoven University of Technology, TU Eindhoven, Eindhoven University of Technology, Department of Applied Physics

  • Roy L. M. Op het Veld

    Department of Applied Physics, Eindhoven University of Technology, TU Eindhoven, Eindhoven University of Technology, Department of Applied Physics, Eindhoven University of Technology

  • John A Logan

    University of California Santa Barbara, Materials Engineering, University of California, Santa Barbara

  • Mihir Pendharkar

    University of California - Santa Barbara, University of California Santa Barbara, Dept. of ECE, University of California Santa Barbara, Department of Electrical and Computer Engineering, University of California, Santa Barbara, Electrical and Computer Engineering, University of California, Santa Barbara, University of California Santa Barbara, Materials Engineering, University of California, Santa Barbara

  • Marina Quintero Perez

    Microsoft Station Q at Delft University of Technology, Microsoft Station Q Delft, Station Q, Microsoft Research

  • Nick van Loo

    Delft University of Technology

  • Alexandra Fursina

    Microsoft Station Q at Delft University of Technology, Station Q, Microsoft Research

  • Kevin Van Hoogdalem

    Microsoft Station Q at Delft University of Technology, Microsoft Station Q Delft, Station Q, Microsoft Research

  • Chris Palmstrom

    University of California, Santa Barbara, University of California - Santa Barbara, University of California Santa Barbara, Electrical & Computer Engineering, University of California, Santa Barbara, ECE and Materials, University of California, Santa Barbara, Dept. of ECE, University of California Santa Barbara, Materials Department, University of California, Santa Barbara, Materials Engineering, University of California, Santa Barbara, University of California Santa Barbara, Materials Engineering, Departments of Electrical and Computer Engineering and Materials, University of California, Santa Barbara

  • Erik P. A. M. Bakkers

    Applied Physics, Eindhoven University of Technology, Eindhoven University of Technology, Applied Physics, Eindhoven Univ. of Technology, Department of Applied Physics, Eindhoven University of Technology, TU Eindhoven, Eindhoven University of Technology, Department of Applied Physics, Physics, TU Eindhoven

  • Leo Kouwenhoven

    Station Q, Microsoft Research, Station Q Delft, Microsoft