Probing non-equilibrium quasiparticle dynamics in transmon qubits: Part 1

ORAL

Abstract

Non-equilibrium quasiparticle excitations negatively affect the performance of superconducting devices. Although the source of non-equilibrium quasiparticles is not well understood, the severity of their effect can be mitigated by improved filtering and device design. We implement Ti-proximitized Al quasiparticle traps aimed at reducing the density of quasiparticles in sensitive regions of superconducting devices. To characterize these traps, we detect individual quasiparticle tunneling events in an offset-charge-sensitive 3D transmon qubit, and correlate these events with qubit transitions. These measurements probe the limit on transmon coherence imposed by quasiparticles, and offer insight into the quasiparticle energy distribution. This talk will focus on experimental design and measurement methods.

*Work supported by ONR, ARO and AFOSR

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Presenters

  • Max Hays

    • Applied Physics, Yale University

Authors

  • Max Hays

    • Applied Physics, Yale University

  • Kyle Serniak

    • Applied Physics, Yale University

  • Gijs De Lange

    • Microsoft Station Q, Delft
    • Microsoft Station Q

  • Shyam Shankar

    • Applied Physics, Yale University
    • Department of Applied Physics, Yale University
    • Department of Applied Physics, Yale Univ
    • Yale Univ

  • Spencer Diamond

    • Applied Physics, Yale University

  • Uri Vool

    • Physics, Harvard University
    • Applied Physics, Yale University
    • Yale Univ

  • Luke Burkhart

    • Applied Physics, Yale University
    • Physics and Applied Physics, Yale University
    • Department of Applied Physics, Yale Univ
    • Yale University
    • Dept. of Applied Physics, Yale University
    • Departments of Applied Physics and Physics, Yale University

  • Ioan-Mihai Pop

    • Karlsruhe Inst of Tech
    • Karlsruhe Institute of Technology
    • Physikalisches Institute, Karlsruhe Inst of Tech
    • Physikalisches Institut, Karlsruhe Institute of Technology
    • Karlsruhe Institut of Technology
    • Physikalishes Institut, Karlsruhe Institute of Technology

  • Luigi Frunzio

    • Yale University
    • Applied Physics, Yale University
    • Physics and Applied Physics, Yale University
    • Applied Physics, Yale Univ
    • Dept. of Applied Physics, Yale University
    • Department of Applied Physics, Yale Univ
    • Yale Univ
    • Departments of Applied Physics and Physics, Yale University

  • Robert Schoelkopf

    • Yale University
    • Applied Physics, Yale University
    • Dept. of Applied Physics, Yale University
    • Department of Applied Physics, Yale Univ

  • Manuel Houzet

    • Univ. Grenoble Alpes, CEA, INAC-Pheliqs

  • Leonid Glazman

    • Applied Physics, Yale University
    • Physics and Applied Physics, Yale University
    • Yale University
    • Department of Physics, Yale University

  • Michel Devoret

    • Yale University
    • Applied Physics, Yale University
    • Department of Applied Physics, Yale University
    • Applied Physics, Yale Univ
    • Physics and Applied Physics, Yale University
    • Yale Univ
    • Dept. of Applied Physics, Yale University
    • Department of Applied Physics, Yale Univ