Advanced hybrid InSb/Al nanowires devices for topological parity readout (Part 1)

ORAL

Abstract

Majorana bound states (MBS) in hybrid semi-superconducting systems have been proposed to be the building blocks of the next quantum computers. Quantum information can be stored in the fermionic parity degree of freedom, shared in two well-separated MBS. A promising method to readout such parity is to measure the conductance through an Aharonov-Bohm (AB) interferometer, hosting a pair of MBS in one of the interfering arms. Here, we report our progress in the realization of such device based on InSb/Al islands. We first investigate the electron-phase evolution in a normal quantum dot embedded in an InSb nanowire network by mapping the phase of AB oscillations. Phase lapse and winding are extracted from the shift of these oscillations and from the associated Fano effect. Secondly, we study the energy spectrum of proximitized InSb nanowires in Coulomb blockade revealing gate-dependent ground state parity transitions as a function of magnetic field. Based on these results and on the development of a new nanofabrication technique, interferometric readout can be performed in both nano-networks and single-nanowire architectures.

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Presenters

  • Francesco Borsoi

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

Authors

  • Francesco Borsoi

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

  • Sebastian Heedt

    Delft University of Technology, QuTech

  • Jie Shen

    Delft University of Technology, QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft University of Technology, QuTech

  • Senja Ramakers

    Delft University of Technology, QuTech

  • Kun Zuo

    Delft University of Technology, QuTech

  • Kevin Van Hoogdalem

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

  • Marina Quintero Perez

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

  • 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

  • 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

  • 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 P Kouwenhoven

    Microsoft Station Q at Delft University of Technology, Microsoft Quantum Delft, Qutech, Delft University of Technology, QuTech, Delft University of Technology, Station Q Delft, Microsoft, Microsoft Station Q Delft, Microsoft Station-Q at Delft University of Technology, Microsoft Station Q Delft, Delft University of Technology