Supercurrent parity meter in a nanowire Cooper-pair transistor

ORAL

Abstract

Semiconductor nanowires coupled with superconductors are a promising platform to construct Majorana zero modes as well as to build up topological fault-tolerant quantum computers. In semiconductor nanowire/superconductor hybridized island, charging energies are introduced and thus even/odd fermion parity of two Majorana zero modes work as a two-level quantum system. By embedding such hybridized islands into superconducting circuit, not only can trivial Andreev bound states and Majorana bound states be distinguished via the supercurrent phase of the island, but also topological-qubit readout and operation can be performed by supercurrent measurements. Here, we insert an InSb-Al hybridized island into a NbTiN superconducting circuit forming a superconducting interference device. In such a device, we find that the switching current of the InSb-Al island depends on its parity and the corresponding superconducting phase also shows parity-dependent behaviours. In this way, the parity of bound states residing in the hybridized island can be read out, which paves the way for parity read out of Majorana superconducting qubits.

*European Research Council (ERC), the Dutch Organization for Scientific Research (NWO), the Office of Naval Research (ONR), Microsoft Corporation Station Q.

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Presenters

  • Jiyin Wang

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

Authors

  • Jiyin Wang

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

  • Constantin Schrade

    • Department of Physics, Massachusetts Institute of Technology

  • Vukan Levajac

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

  • David van Driel

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

  • Sasa Gazibegovic

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

  • Roy Op het Veld

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

  • Joon Sue Lee

    • California NanoSystems Institute, University of California Santa Barbara

  • Mihir Pendharkar

    • Electrical and Computer Engineering, University of California Santa Barbara
    • University of California Santa Barbara
    • University of California, Santa Barbara

  • Connor P. Dempsey

    • Materials Engineering, University of California Santa Barbara

  • Chris J Palmstrom

    • California NanoSystems Institute, University of California Santa Barbara
    • University of California, Santa Barbara
    • University of California Santa Barbara

  • Erik P. A. M. Bakkers

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

  • Liang Fu

    • Department of Physics, Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • Leo Kouwenhoven

    • Microsoft station Q Delft
    • Microsoft Station Q Delft
    • Quantum Lab Delft, Microsoft
    • Microsoft Quantum Lab Delft
    • Quantum lab Delft, Microsoft
    • Microsoft Corp
    • Station Q Delft, Microsoft

  • Jie Shen

    • Chinese Academy of Sciences
    • QuTech, Delft University of Technology