Dressed-state engineering for continuous detection of itinerant microwave photons
Kazuki Koshino, Zhirong Lin, K. Inomata, Tsuyoshi Yamamoto, Yasunobu Nakamura · Physical Review A · 2016
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 $\mathrm{\ensuremath{\Lambda}}$ 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 10 MHz.