Quasiparticle Poisoning in a Proximitized Semiconductor Nanowire Qubit

ORAL

Abstract

Topological qubits are predicted to have very long coherence times due to their inherent protection against local perturbations. However, non-parity preserving processes such as quasiparticle poisoning (QPP) set the bandwidth requirements for controlling topological qubits. Quasiparticle poisoning rates have been recorded in conventional superconducting transmon qubits [1, 2] and in hybrid proximitized semiconductor nanowire junctions [3] at zero magnetic field.
Here we perform QPP measurements on nanowire transmons in a magnetic field by monitoring parity-dependent shifts of the transmon’s readout resonator. We investigate the magnetic field dependence of the QPP up to magnetic fields required to reach the topological phase.

[1] D. Riste et al., Nat. Commun. 4, 1913 (2013)
[2] K. Serniak et al., Phys. Rev. Lett. 121, 157701 (2018)
[3] M. Hays et al., Phys. Rev. Lett. 121, 047001 (2018)

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

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Presenters

  • Willemijntje Uilhoorn

    • QuTech, Delft University of Technology

Authors

  • Willemijntje Uilhoorn

    • QuTech, Delft University of Technology

  • Arno Bargerbos

    • QuTech, Delft University of Technology
    • TU Delft

  • James Kroll

    • QuTech, Delft University of Technology

  • Jasper Van Veen

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

  • Chung-Kai Yang

    • Station Q Delft, Microsoft

  • Jesper Nygård

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

  • Peter Krogstrup

    • Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
    • Station Q Lyngby, Microsoft
    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen
    • Center For Quantum Devices and Microsoft Quantum Materials Lab - Copenhagen, Niels Bohr Institute, University of Copenhagen

  • Leo Kouwenhoven

    • Station Q, Microsoft Research
    • Station Q Delft, Microsoft

  • Angela Kou

    • Station Q Delft, Microsoft
    • Yale Univ

  • Gijs De Lange

    • Microsoft Quantum Delft
    • Yale Univ
    • Station Q Delft, Microsoft
    • Microsoft Station Q Delft, Delft University of Technology