Quantum non-demolition detection of single itinerant microwave photons

ORAL

Abstract

The detection of microwave photons is an important capability for superconducting quantum information processing and microwave quantum optics but remains challenging due to the small energy of photons at this frequency. Our circuit quantum electrodynamics (cQED) based detector [1] exploits the superradiant ‘bright’ and subradiant ‘dark’ states that are formed when transmons are coupled an appropriate distance from each other on a waveguide [2]. Detuning each transmon inhomogeneously from the operating frequency leads to coupling of the bright and dark states which allows for absorbed photons to be trapped for longer than the inverse of the absorption bandwidth. We utilize this long interaction time to achieve high-fidelity measurements of the photon number in the ensemble. Using a single photon source, we benchmark the performance of this protocol.
[1] B. Royer et al., Phys. Rev. Lett. 120, 203602 (2018)
[2] A. F. van Loo et al., Science 342 1494 (2013)

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Presenters

  • John Mark Kreikebaum

    Univ of California – Berkeley, University of California, Berkeley

Authors

  • John Mark Kreikebaum

    Univ of California – Berkeley, University of California, Berkeley

  • Kevin P. O'Brien

    Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Electrical Engineering and Computer Science, Research Laboratory of Electronics, Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA, University of California, Berkeley

  • Baptiste Royer

    Université de Sherbrooke, Universite de Sherbrooke

  • Arne Grimsmo

    University of Sydney, Physics, The University of Sydney, The University of Sydney, Univ of Sydney

  • Alexandre Blais

    Institut Quantique and Département de Physique, Université de Sherbrooke, Université de Sherbrooke, Universite de Sherbrooke, Université de Sherbrooke, Institut quantique and Département de Physique, Univ. of Sherbrooke, Institut Quantique and Département de Physique, Université de Sherbrooke, Sherbrooke, QC, Canada, J1K 2R1

  • Irfan Siddiqi

    University of California, Berkeley, Physics, University of California, Berkeley, Univ of California – Berkeley, Univ of California - Berkeley, Physics, Univ of California – Berkeley