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.

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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