Tunable coupler for high-fidelity two-qubit gates in fluxonium

ORAL

Abstract

The superconducting fluxonium qubit has emerged as a promising alternative to the widely-studied transmon qubit due to increased coherence times at the half-flux quantum sweet-spot, large anharmonicity, and robust charge-noise insensitivity. Scaling to multi-qubit fluxonium systems requires implementation of fast, high-fidelity, and highly expressive quantum gates, with small residual coupling when the gate is off. In this work we present the design of and experimental progress towards realizing a 2D tunable coupler composed of a tunable fluxonium element and a direct coupling path achieving these requirements. We study the family of gates realizable with charge and flux control, and investigate their limits with regard to gate time, leakage, and drive-induced decoherence.

*This work was supported by the U.S. Army Research Laboratory and the U.S. Army Research Office under contract/grant number W911NF-22-1-0258.

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Presenters

  • Noah J Stevenson

    • University of California, Berkeley

Authors

  • Noah J Stevenson

    • University of California, Berkeley

  • Zahra Pedramrazi

    • University of California, Berkeley

  • Noah Goss

    • University of California Berkeley

  • Abhishek Chakraborty

    • University of Rochester

  • Bibek Bhandari

    • Institute for Quantum Studies, Chapman University
    • Department of Physics and Astronomy, University of Rochester

  • Lucas Burns

    • Institute for Quantum Studies, Chapman University

  • Long B Nguyen

    • Lawrence Berkeley National Laboratory

  • Ravi K Naik

    • Lawrence Berkeley National Laboratory

  • Andrew N Jordan

    • University of Rochester
    • Chapman University

  • Justin G Dressel

    • Chapman Univ

  • David I Santiago

    • Lawrence Berkeley National Laboratory

  • Irfan Siddiqi

    • University of California, Berkeley
    • Lawrence Berkeley National Laboratory