Characterization of topologically protected charge-parity qubits: Part 2

ORAL

Abstract

Decoherence poses a major impediment to the implementation of large-scale quantum processing with superconducting qubits. There have been tremendous improvements in superconducting qubit coherence times over the past two decades, with current state-of-the-art coherence levels approaching the threshold for fault-tolerant quantum computing. Nevertheless, for scalability, high-fidelity qubit control and qubits protected from sources of noise at the hardware level are needed. We implement qubit protection with pi-periodic superconducting elements made from flux-biased plaquettes of kinetic inductors and Josephson junctions that allow only double Cooper pair tunneling. The amount of protection from noise in such plaquette-based qubits can be further increased by concatenating plaquettes. We describe the design and characterization of a plaquette-based qubit with an embedded SQUID switch.

*Supported by the U.S. Government under Grant W911NF-18-1-0106

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Presenters

  • FNU Naveen

    • University of Wisconsin - Madison
    • Physics, University of Wiconsin - Madison

Authors

  • FNU Naveen

    • University of Wisconsin - Madison
    • Physics, University of Wiconsin - Madison

  • Abigail J Shearrow

    • University of Wisconsin - Madison
    • Physics, University of Wiconsin - Madison

  • Shaojiang Zhu

    • University of Wisconsin - Madison
    • Physics, University of Wiconsin - Madison

  • Kenneth Dodge

    • Physics, Syracuse University
    • Syracuse University

  • Yebin Liu

    • Physics, Syracuse University
    • Syracuse University

  • Michael Senatore

    • Physics, Syracuse University
    • Syracuse University

  • Andrey Klots

    • University of Wisconsin - Madison
    • Physics, University of Wiconsin - Madison

  • Lara Faoro

    • University of Wisconsin - Madison
    • Physics, University of Wiconsin - Madison

  • Lev B Ioffe

    • Google.; University of Wisconsin - Madison
    • University of Wisconsin - Madison
    • Physics, University of Wiconsin - Madison
    • University of Wisconsin

  • Britton L Plourde

    • Syracuse University
    • Physics, Syracuse University

  • Robert F McDermott

    • University of Wisconsin - Madison
    • Department of Physics, University of Wisconsin-Madison, Madison WI, USA
    • Physics, University of Wiconsin - Madison