Symmetrically Threaded SQUIDs Amplifier for Kerr-cat Qubit Readout

Oral-In-person

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.

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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

  • David Santiago

    • Lawrence Berkeley National Laboratory

  • Justin Dressel

    • Chapman University

  • Irfan Siddiqi

    • University of California, Berkeley

  • Andrew Jordan

    • Chapman University