Characterization of dc SQUID damping on superconducting resonant circuits

ORAL

Abstract

The high bandwidth, high dynamic range, low noise characteristics, and maturity of dc SQUIDs make them a versatile tool for a variety of precision measurements, including readout of resonant circuits in applications such as quantum information, gravitational wave detection, and dark-matter detection. The dc SQUID is a lossy active circuit with a dynamic input impedance that varies based on its detailed design, temperature, magnetic flux, current, voltage operating points, and applied feedback. Coupling a dc SQUID to a resonant circuit can modify the circuit's resonance frequency, quality factor, noise, and impedance. We present experimental measurements of dc SQUID-induced damping effects on highly coupled, lumped-element resonators in the 500kHz-1MHz regime.

*This research is funded in part by the Gordon and Betty Moore Foundation. Additional support was provided by the Heising-Simons Foundation.

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Presenters

  • Elizabeth C van Assendelft

    • Stanford University

Authors

  • Elizabeth C van Assendelft

    • Stanford University

  • Hsiao-Mei Cho

    • SLAC - Natl Accelerator Lab

  • Jason Corbin

    • Stanford University

  • Fedja Kadribasic

    • Stanford Univ

  • Stephen E Kuenstner

    • Stanford Univ

  • Dale Li

    • SLAC - Natl Accelerator Lab

  • Arran T Phipps

    • California State University, East Bay

  • Nicholas M Rapidis

    • Stanford Univ

  • Maria Simanovskaia

    • University of California, Berkeley

  • Jyotirmai Singh

    • Stanford Univ

  • Betty Young

    • Santa Clara University

  • Kent D Irwin

    • Stanford Univ