Superconducting Low-Inductance Undulatory Galvanometer Microwave Amplifier: Theory

ORAL

Abstract

We present numerical studies of a phase-insensitive microwave linear amplifier based on the Superconducting Low-Inductance Undulatory Galvanometer (SLUG). Direct integration of the junction equations of motion provides access to the full scattering matrix of the SLUG element. We discuss the optimization of SLUG amplifiers and calculate amplifier gain and noise temperature in both the thermal and quantum regimes. The microwave SLUG amplifier is expected to achieve noise performance approaching the standard quantum limit in the frequency range from 5-10 GHz, with gain around 15 dB for a single-stage device and instantaneous bandwidth of order hundreds of MHz. We compare our numerical model with measured performance of state-of-the-art devices.

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Authors

  • David Hover

    University of Wisconsin-Madison Department of Physics, University of Wisconsin-Madison

  • Guilhem Ribeill

    University of Wisconsin-Madison Department of Physics, University of Wisconsin-Madison

  • Yung-Fu Chen

    Department of Physics, National Central University, University of Wisconsin-Madison

  • Shaojiang Zhu

    University of Wisconsin, University of Wisconsin-Madison

  • Robert McDermott

    University of Wisconsin-Madison, University of Wisconsin-Madison Department of Physics, Department of Physics, University of Wisconsin-Madison