Fluxonium Qubit in a 3D Cavity: Measurement and Analysis

ORAL

Abstract

We present measurements of a fluxonium qubit [1] in a 3D copper cavity. The fluxonium qubit is composed of a Josephson junction shunted by an array of 90 larger Josephson junctions approximating a linear inductor. In a manner similar to transmon qubits, the coherence times of fluxonium in a 3D cavity have increased when compared to on-chip resonator implementations. Additionally, the fluxonium Hamiltonian can be, by design, less sensitive to decoherence than the transmon. We present measurements of relaxation times for the entire range of flux variation and discuss energy relaxation in light of dielectric, inductive, and quasiparticle losses. \\[4pt] [1] Manucharyan et al., Science, 326 (2009)

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Authors

  • K. Geerlings

    Applied Physics Department, Yale University

  • Ioan Pop

    Applied Physics Department, Yale University

  • N. Masluk

    Applied Physics Department, Yale University

  • A. Kamal

    Applied Physics Department, Yale University

  • Gianluigi Catelani

    Forschungszentrum Juelich, Peter Gruenberg Institut, Department of Physics and Applied Physics, Yale University

  • Leonid Glazman

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

  • Michel Devoret

    Applied Physics Department, Yale University