Noise Characteristics of Superconducting Low-Inductance Undulatory Galvanometer

ORAL

Abstract

We describe theoretical studies of the Superconducting Low-Inductance Undulatory Galvanometer (SLUG), a non-reciprocal gain element based on Josephson junctions. We use both analytical and numerical methods to calculate various properties of the SLUG, including power gain, added noise and back-action in both the thermal and quantum regimes. We derive the distribution functions of the output signals in the presence of classical noise using the Fokker-Planck equation. We also discuss optimal matching of the SLUG amplifier so that gain, bandwidth and noise performance can meet the criteria of high-fidelity multiplexed qubit readout.

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Authors

  • Wenshuo Liu

    University of Wisconsin - Madison

  • Maxim Vavilov

    Univ of Wisconsin, Madison, University of Wisconsin - Madison

  • Robert McDermott

    Univ of Wisconsin, Madison, University of Wisconsin - Madison, University of Wisconsin, University of Wisconsin - Madison, Madison, WI, University of Wisconsin-Madison, University of Wisconsin, Madison