Efficient photon detection with a Josephson Parametric Amplifier

ORAL

Abstract

Josephson Parametric Amplifiers (JPAs) are an important resource in quantum limited measurement, feedback and nonclassical state generation. To study the JPA transformation, we use a superconducting qubit-cavity system to launch single photons or, n=1 Fock states, into a JPA, which measures the state. From repeated measurements, we can infer the state's loss of purity as a results of the JPA transformation. We will present our estimates of the JPA's efficiency as a photon detector in comparison to Gaussian characterization methods.

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Authors

  • W.F. Kindel

    JILA, University of Colorado

  • M.D. Schroer

    JILA

  • Michael Vissers

    NIST, NIST - Boulder, National Institute of Standards and Technology

  • J. Gao

    NIST

  • David Pappas

    NIST, National Institute of Standards and Technology, National Institute of Standards and Technology, Boulder, CO

  • K.W. Lehnert

    JILA, National Institute of Standards and Technology, and the University of Colorado, Boulder, Colorado 80309, USA, JILA, University of Colorado