Gap-engineered quasiparticle traps in the fluxonium artificial atom

ORAL

Abstract

Recent experiments have shown that the density of quasiparticles in superconducting quantum circuits exceeds the expected thermal density. In Josephson junction based superconducting qubits, these non-equilibrium quasiparticles can tunnel through the junctions of the circuit, causing decoherence. Quasiparticle traps aim to reduce the density of quasiparticles near the junctions, and therefore the rate of energy loss and dephasing due to tunneling events. These traps must be designed to not introduce any additional losses in the qubit. In this talk we will discuss recent progress in the design and implementation of quasiparticle traps in the fluxonium artificial atom.

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Authors

  • 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

  • Uri Vool

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

  • M. Hays

    Department of Applied Physics, Yale University

  • Luke Burkhart

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

  • 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

  • K. Sliwa

    Department of Applied Physics, Yale University, Yale University

  • I.M. Pop

    Department of Applied Physics, Yale University, and Physikalisches Institut, Karlsruhe Institute of Technology

  • 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

  • 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

  • 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