Characterizing an itinerant microwave Fock state compatible with transfer to a macroscopic mechanical oscillator

ORAL

Abstract

Transferring propagating single-photon signals generated by a qubit to a mechanical oscillator offers a way to prepare non-classical motional states of a macroscopic object. In this concept, a highly coherent transmon qubit in a cavity is used to create single itinerant microwave photons. These photons can then be directed towards a tunable electromechanical circuit where they can be converted into single phonons. In this talk, we present measurements of itinerant single photons engineered to realize this concept. In particular, we: characterize their quantum state tomographically, demonstrate that they have sufficiently narrow bandwidth for capture by an electromechanical circuit, and measure the efficiency with which they travel between microwave cavities.

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Authors

  • Lucas Sletten

    JILA, University of Colorado, Boulder, Colorado, Department of Physics, University of Colorado, Boulder, Colorado, USA

  • A.P. Reed

    JILA, University of Colorado, Boulder, Colorado

  • Xizheng Ma

    JILA, University of Colorado, Boulder, Colorado

  • L.D. Burkhart

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

  • M. Reagor

    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

  • Wolfgang Pfaff

    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.

  • 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

  • Konrad Lehnert

    JILA, University of Colorado, Boulder, National Institute of Standards and Technology, Boulder, JILA and National Institute of Standards and Technology, Boulder, Colorado, JILA, University of Colorado and NIST, Boulder, Colorado, USA; Department of Physics, University of Colorado, Boulder, Colorado, USA, JILA, University of Colorado, NIST-Boulder