Dressed-state engineering for continuous detection of itinerant microwave photons

  1. Kazuki Koshino,
  2. Zhirong Lin,
  3. Kunihiro Inomata,
  4. Tsuyoshi Yamamoto,
  5. and Yasunobu Nakamura
We propose a scheme for continuous detection of itinerant microwave photons in circuit quantum electrodynamics. In the proposed device, a superconducting qubit is coupled dispersively to two resonators: one is used to form an impedance-matched Λ system that deterministically captures incoming photons, and the other is used for continuous monitoring of the event. The present scheme enables efficient photon detection: for realistic system parameters, the detection efficiency reaches 0.9 with a bandwidth of about ten megahertz.
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