Implementation of a microwave readout for scanning superconducting quantum interference devices (SQUIDs)

ORAL

Abstract

In scanning superconducting quantum interference device (SQUID) microscopy a SQUID is rastered close to the surface of a sample to obtain images of the sample’s magnetic properties. In this talk we will discuss a microwave readout for scanning SQUIDs that incorporate an on-chip capacitor as reported in [1]. In this case, the SQUID acts as a flux-dependent inductor, that forms an LC resonant circuit with the on-chip capacitor. The phase and amplitude of microwaves reflected by this circuit encode changes in magnetic flux. We will present our progress towards implementing this microwave readout and characterizing the SQUID noise performance at mK temperatures. The microwave readout holds the promise to both increase our flux sensitivity to below 100nPhi_0/sqrt(Hz) and our measurement bandwidth to several hundreds of MHz [1].
[1] Foroughi et al., APL 112, 252601 (2018)

*This work was supported by the Cornell Center for Materials Research with funding from the NSF MRSEC program (DMR-1719875). The SQUIDs used in this study were developed under an NSF IMR-MIP contract, Award No. 0957616.

–

Presenters

  • Rachel Resnick

    • Cornell University

Authors

  • Rachel Resnick

    • Cornell University

  • Justin Oh

    • Cornell University

  • Farshad Foroughi

    • Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France
    • RWTH Aachen University

  • Jan-Michael Mol

    • RWTH Aachen University

  • Alexander B Jarjour

    • Cornell University

  • David Low

    • Laboratory of Atomic and Solid State Physics, Cornell University
    • Applied and Engineering Physics, Cornell University
    • Cornell University

  • John Robert Kirtley

    • Stanford University

  • Hendrik Bluhm

    • JARA-FIT Institute Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, 52074 Aachen, Germany
    • JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, 52074 Aachen, Germany
    • JARA-FIT Institute Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University
    • RWTH Aachen University

  • Katja Nowack

    • Laboratory of Atomic and Solid State Physics, Cornell University
    • Department of Physics, Cornell University
    • Cornell University