[19a-E208-1~10] 【CS.3】 Code-sharing Session of 3.10 & 3.11 & 9.2 & 11.5 & 13.6

[19a-E208-8] Microwave Single-Photon Detection Using Superconducting Quantum Circuits

Ivan Iakoupov¹, Yuichiro Matsuzaki¹, William J. Munro¹, 〇Shiro Saito¹ (1.NTT BRL)

Keywords:Superconductivity, Single phoyon detectors, Quantum bits

We propose a non-absorbing microwave single-photon detector using superconducting quantum circuits. Our device, where a qubit is coupled to both an input transmission line and a resonator, can detect an input single photon by measuring a change of a resonator state. The calculated distinguishability, namely probability of distinguishing between no photon and one photon, goes up to 98%. We utilize the resonator with high quality factor as the detector. This might lead to better distinguishability than existing detectors where a qubit plays a role of a detector because a coherence time of resonators is usually longer than that of qubits.