Symmetrically Threaded SQUIDs Amplifier for Kerr-cat Qubit Readout

ORAL

Abstract

Josephson parametric amplifiers (JPA) have been used ubiquitously to assist superconducting qubits achieve fast, high fidelity, and quantum nondemolition readouts for effective quantum information processing. Ideally, JPAs are supposed to perform as perfect amplifiers. However, in practice their performance is limited by higher-order corrections, primarily the Kerr nonlinearity. In our work, we design a flux-pumped symmetrically threaded SQUIDs (STS) amplifier which allows us to operate at the Kerr-free point and performs just like a quantum-limited Degenerate Parametric Amplifier. We investigate the effects of our STS amplifier on signal-to-noise ratio (SNR), fidelity, and speed of the Kerr-cat qubit readout.

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

  • KAGAN YANIK

    • University of Rochester/Chapman University

Authors

  • KAGAN YANIK

    • University of Rochester/Chapman University

  • Irwin Huang

    • University of Rochester

  • Bibek Bhandari

    • Chapman University

  • Bingcheng Qing

    • University of California, Berkeley

  • AHMED HAJR

    • University of California, Berkeley

  • Ke Wang

    • University of California, Berkeley
    • Lawrence Berkeley National Laboratory

  • David Ivan Santiago

    • Lawrence Berkeley National Laboratory

  • Justin Dressel

    • Chapman University

  • Irfan Siddiqi

    • University of California, Berkeley

  • Andrew N Jordan

    • Chapman University