Experimental control-Z two qubit gate on 2D Kerr cats

ORAL

Abstract

We investigate the realization of scalable, high-quality multi-qubit systems compatible with quantum error correction for noise-biased qubits. Previous research has focused on implementing Kerr-cat qubits using superconducting circuits, where Schrödinger cat states have exhibited long lifetimes and high coherence even at large cat sizes. However, a systematic study of two-qubit gates between Kerr-cat qubits—particularly to assess whether they can achieve fidelities below the fault-tolerant threshold—has remained incomplete. Here, we design and characterize the interaction between two coupled Kerr-cat qubits based on our high-coherence planar architecture with on-chip Purcell filters. We implement and analyze gate performance through randomized benchmarking and gate set tomography, demonstrating the feasibility of high-fidelity operations in this noise-biased bosonic platform.

*Research was sponsored by the Army Research Office and was accomplished under Grant Number W911NF-22-1-0258 and 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

  • Ke Wang

    • University of California, Berkeley
    • Lawrence Berkeley National Laboratory

Authors

  • Ke Wang

    • University of California, Berkeley
    • Lawrence Berkeley National Laboratory

  • Bingcheng Qing

    • University of California, Berkeley

  • AHMED HAJR

    • University of California, Berkeley

  • Bibek Bhandari

    • Chapman University

  • Irwin Huang

    • University of Rochester

  • Chuan-Hong Liu

    • Lawrence Berkeley National Laboratory

  • Justin Dressel

    • Chapman University

  • Andrew N Jordan

    • Chapman University

  • David Ivan Santiago

    • Lawrence Berkeley National Laboratory

  • Irfan Siddiqi

    • University of California, Berkeley