Noise characterization of suspended Josephson junction arrays

ORAL

Abstract

Superinductors are an essential component of many superconducting qubit designs, including fluxonium or the 0-π qubit. One of the most popular methods to realize such superinductors is an array of Josephson junctions, where their quality will impact the qubit's coherence. In this work, we investigate noise and instabilities affecting these arrays, such as arising from phase slips or nonequilibrium quasiparticles, where the arrays are either situated on a silicon substrate or suspended in vacuum above the substrate. Arrays of different junction number and geometry are explored to elucidate the noise processes in Josephson junction arrays, informing us how to best design these components to implement in qubit architectures.

*This work was supported by the U.S. Army Research Laboratory and the U.S. Army Research Office under contract/grant number W911NF-22-1-0258. This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE 1752814. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.

–

Presenters

  • Trevor Chistolini

    • University of California, Berkeley

Authors

  • Trevor Chistolini

    • University of California, Berkeley

  • Christian Juenger

    • University of California, Berkeley

  • Long B Nguyen

    • Lawrence Berkeley National Laboratory

  • Larry Chen

    • University of California, Berkeley

  • Hyunseong Kim

    • University of California, Berkeley

  • David I Santiago

    • Lawrence Berkeley National Laboratory

  • Irfan Siddiqi

    • University of California, Berkeley
    • Lawrence Berkeley National Laboratory