Development of Superconducting Qubit Circuits to Coherently Probe Majorana Zero Modes Part II: Experimental Results

ORAL

Abstract

A proximitized semiconducting nanowire (NW) with high spin-orbit coupling is one of the most promising candidate systems to achieve a topologically protected qubit. Several proposals for achieving such a qubit use proximitized superconducting islands connected via gate-tunable Josephson junctions [1,2]. When two such islands are tuned to the topological regime the hybridization of the Majorana zero modes at the junction give rise to the fractional Josephson coupling. This additional coupling shows as additional features in the transition spectrum.
Here we perform microwave spectroscopy of NW island-devices with low charging energy using a superconducting λ/2 coplanar waveguide resonator. We study microwave transitions in the presence of in-plane fields large enough to enter the topological regime.

References:
[1] E. Ginossar et al., Nat. Commun, 5, 4772 (2014)
[2] D. Aasen et al, Phys. Rev. X, 6, 031016 (2016)

*This work was supported by Microsoft, the Netherlands Organisation for Scientific Research (NWO/OCW) and the Danish National Research Foundation.

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Presenters

  • Willemijn Uilhoorn

    • QuTech, Delft Univ. of Technology
    • QuTech, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

Authors

  • Willemijn Uilhoorn

    • QuTech, Delft Univ. of Technology
    • QuTech, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Anders Kringhøj

    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute
    • Niels Bohr Institute, Univ of Copenhagen

  • James Kroll

    • QuTech, Delft Univ. of Technology
    • QuTech, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Lucas Casparis

    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute
    • Niels Bohr Institute, Univ of Copenhagen

  • Thorvald Larsen

    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute

  • Bernard Van Heck

    • Station Q, Microsoft Research

  • Tim Stegwee

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

  • Robert McNeil

    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute

  • Marina Hesselberg

    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute
    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen

  • Oscar Erlandsson

    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute
    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen

  • Jesper Nygard

    • Center for quantum devices, Niels Bohr Institute
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute
    • Center for Quantum Devices and Station-Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center of Quantum Devices and Nano-Science Center, Niels Bohr Institute, University of Copenhagen

  • Peter Krogstrup

    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute
    • Center for Quantum Devices and Station-Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • University of Copenhagen

  • Karl Petersson

    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute
    • Niels Bohr Institute, Univ of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen

  • Gijs de Lange

    • Station Q Delft, Microsoft

  • Charles Marcus

    • Center for Quantum Devices and Microsoft Station Q Copenhagen, Niels Bohr Institute
    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • 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
    • Niels Bohr Institute, Univ of Copenhagen
    • Univ of Copenhagen
    • University of Copenhagen

  • Leo Kouwenhoven

    • Microsoft Station-Q Delft, Delft University of Technology
    • Delft Univ of Tech
    • Qutech and Kavli Institute of Nanoscience and Microsoft Station Q Delft, Delft University of Technology
    • QuTech, Kavli Institute of Nanoscience, Station Q at Delft University of Technology, Delft University of Technology
    • Microsoft Station-Q at Delft University of Technology
    • Delft Univ. of Technology, Microsoft Station Q
    • Station Q Delft, Microsoft
    • Microsoft Station Q