Fig. 1. Entanglement preparation scheme based on superconducting 180° hybrid ring coupler.基于超导180°混合环纠缠制备方案

Fig. 2. A scheme for single-photon detection using a transmon.基于单transmon的微波光子探测系统

Fig. 3. Squeezing angle locking scheme based on microwave photon counter.基于微波光子计数的压缩角锁定方案

Fig. 4. Output properties before and after locking squeezing angle.相对压缩角锁定前后输出特性

Fig. 5. Degree of output entanglement before and after locking squeezing angle (real line, before locking; dashed line, after locking).相对压缩角锁定前后输出纠缠度(实线, 锁定前; 虚线, 锁定后)