Nonlinear WSi Nanowire Constrictions in Superconducting Quantum Circuits

ORAL

Abstract

Kinetic inductance materials have been used to provide high inductance and nonlinearity while maintaining a small device footprint in superconducting devices such as detectors, amplifiers and other inductive elements. Inclusion of these nanowires in superconducting qubits has the potential to provide new nonlinear elements such as weak link junctions or quantum phase slip elements. In this talk, we explore the nonlinear behavior of nanowire constrictions fabricated from tungsten silicide (WSi), an amorphous high kinetic inductance material. We study various devices including RF-SQUIDs with different nanowire geometries. We report on the current phase relationship of these WSi constrictions and their potential to expand the toolbox of superconducting qubits.

*This work was partially funded through the National Science Foundation Graduate Research Fellowship under Grant No. DGE 2040434.

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Presenters

  • Sarah Jones

    • University of Colorado, Boulder
    • University of Colorado Boulder

Authors

  • Sarah Jones

    • University of Colorado, Boulder
    • University of Colorado Boulder

  • Trevyn F.Q. F Larson

    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology
    • University of Colorado
    • University of Colorado Boulder, National Institute of Standards and Technology
    • University of Colorado Boulder, National Institute of Standards and Technology Boulder

  • Sai Pavan Chitta

    • Northwestern University

  • Jens Koch

    • Northwestern University

  • Ray W Simmonds

    • National Institute of Standards and Technology, University of Colorado Boulder
    • National Institute of Standards and Technology
    • National Institute of Standards and Technology Boulder
    • The Global Coherence Project

  • András Gyenis

    • University of Colorado, Boulder
    • University of Colorado Boulder
    • Univ of Copenhagen