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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.

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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