High-Fidelity Two-Qubit Gates Between Fluxonium Qubits Using a Tunable Coupler

ORAL

Abstract

Tunable couplers provide a promising platform for the realization of efficient two-qubit gates, capitalizing on their potential for achieving a substantial on/off coupling ratio and eliminating residual interactions within a single design. In this work, we theoretically explore designs for fast, high-fidelity two-qubit gates between superconducting fluxonium qubits using a floating SQUID as a tunable coupler. We investigate the performance of both fast-flux and parametric gate designs by modulating the flux through the coupler and consider the impact of junction asymmetry. We also explore the possibility of using this coupler to achieve fast, high fidelity readout for fluxonium qubits beyond what is possible with capacitively coupling to the readout resonator.

* Research was sponsored by the Army Research Office and was accomplished under Grant Number W911NF-23-1-0323. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Office or the U.S. Government.

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Presenters

  • Abhishek Chakraborty

    Chapman University, University of Rochester

Authors

  • Abhishek Chakraborty

    Chapman University, University of Rochester

  • Bibek Bhandari

    Institute for Quantum Studies, Chapman University, Chapman University

  • Noah J Stevenson

    University of California, Berkeley

  • Zahra Pedramrazi

    University of California, Berkeley

  • Noah Goss

    University of California Berkeley, University of California, Berkeley

  • Chuan-Hong Liu

    University of California, Berkeley, University of Wisconsin - Madison, University of California Berkeley

  • Andrew N Jordan

    University of Rochester, Chapman University

  • Justin G Dressel

    Chapman Univ, Chapman University

  • David I Santiago

    Lawrence Berkeley National Laboratory

  • Irfan Siddiqi

    University of California, Berkeley

  • Daniel D Briseno-Colunga

    Chapman University