Inductive coupling to the fluxonium qubit

ORAL

Abstract

Fluxonium is a highly anharmonic artificial atom, which utilizes an inductance formed by an array of large Josephson junctions to shunt the junction of a Cooper-pair box. The first excited state transition frequency is widely tunable with flux, and due to interactions of transitions to the second excited state with the readout cavity, a dispersive readout is possible over the entire five octave range. Previous fluxonium samples relied on a capacitive coupling to the readout cavity, but there is evidence that dielectric losses in these capacitors contributes significantly to relaxation [1]. We present a new method of coupling to the cavity through a mutual inductance, reducing relaxation through dielectric loss. \\[4pt] [1] V. E. Manucharyan et al., arXiv:1012.1928v1 (2010).

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Authors

  • N.A. Masluk

    Yale University, Applied Physics, Yale University

  • Archana Kamal

    Yale University, Applied Physics, Yale University, Departments of Physics and Applied Physics, Yale University, Applied Physics - Yale University

  • Ioan Pop

    Yale University, Applied Physics, Yale University, Yale University, QLAB

  • Zlatko Minev

    Yale University, Applied Physics, Yale University, Yale University, QLAB

  • Vladimir Manucharyan

    Harvard University

  • Jens Koch

    Northwestern University, Department of Physics and Astronomy, Northwestern University

  • Leonid Glazman

    Yale University

  • Michel Devoret

    Yale University, Applied Physics, Yale University, Applied Physics Department Yale University, Department of Applied Physics, Yale University, Departments of Physics and Applied Physics, Yale University, Applied Physics - Yale University, Yale University, Dept. of Applied Physics, Applied Physics Dept. Yale University