Cooper Pair Box Qubit in the Ultrastrong Coupling Regime

ORAL

Abstract

We propose a new superconducting qubit design, where a small Josephson junction is inserted in the central conductor of a coplanar waveguide resonator. In this distributed element design, the resonator provides a negative reactance for the junction, which modifies the charging energy $E_C$ of the junction and places the qubit far in the ``Transmon regime'', $E_J \gg E_C$, where $E_J$ is the Josephson energy of the junction. We will discuss design details and show preliminary fabrication and measurement results.

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Authors

  • Markus Brink

    Yale University

  • Michael Metcalfe

    Yale University

  • Luigi Frunzio

    Yale University

  • Vladimir E. Manucharyan

    Yale Applied Physics, Yale University

  • Jens Koch

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

  • Terri M. Yu

    Yale University

  • Steven Girvin

    Yale University, Yale University Dept of Physics

  • Rob Schoelkopf

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

  • Michel H. Devoret

    Yale University