Normal Metal Quasiparticle Traps in 3D-Transmon Qubits

ORAL

Abstract

Quasiparticles are a known source of decoherence in Josephson-junction based superconducting qubits. While equilibrium quasiparticles should not be present in devices operated at dilution refrigeration temperatures well below the superconducting energy gap, non-thermal quasiparticles have been observed in many different superconducting qubits, including 3D-transmons and fluxonium qubits. Vortices induced by applied magnetic fields have been shown to improve non-equilibrium quasiparticle decay rates and improve coherence times by creating regions of the superconductor with vanishing energy gap, which act as quasiparticle traps. We aim to further mitigate quasiparticle-induced limits on coherence by engineering strong trapping via the introduction of normal metal to the superconducting qubit. In this talk, we present recent results regarding normal metal quasiparticle traps in 3D-transmon qubits.

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Authors

  • L.D. Burkhart

    Department of Applied Physics and Physics, Yale University, Department of Physics and Applied Physics, Yale University, New Haven, Connecticut

  • Yvonne Y. Gao

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

  • Chen Wang

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

  • Kyle Serniak

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

  • Gijs de Lange

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

  • Yiwen Chu

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

  • Uri Vool

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

  • L. Frunzio

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

  • M. H. Devoret

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

  • Gianluigi Catelani

    Peter Grunberg Institut (PGI-2), Forschungszentrum Julich

  • Leonid Glazman

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

  • R. J. Schoekopf

    Yale University, Department of Applied Physics, Yale University, Department of Applied Physics and Physics, Yale University, Department of Physics and Applied Physics, Yale University, New Haven, Connecticut, Departments of Applied Physics and Physics, Yale University, New Haven, Connecticut, USA., Yale University, Department of Applied Physics, Yale University Department of Applied Physics