Fig. 1. Relevant ⁸⁷Rb atomic levels: (a) and (b) are writing process and reading process of the SRS process. σ⁺ (σ⁻) represents right (left) polarization of emitted photon. W (R) represents writing(reading) field. 实验能级图　(a)和(b)分别为自发拉曼散射的写过程和读过程, σ⁺ (σ⁻)代表右旋圆偏振(左旋圆偏振)的斯托克斯光场和反斯托克斯光场; W表示写光, R表示读光

Fig. 2. Experimental setup. PBS, polarization beam splitter; SMF, single mode fiber; SPD, single photon detector; , half wave plate; , quarter wave plate; Filter, F-P etalon. 实验装置, 其中PBS为偏振分束棱镜, SMF为单模光纤, SPD为单光子探测器, 为二分之一波片, 为四分之一波片, Filter为滤波器

Fig. 3. Time sequence of experiment (Trig represents the trigger signal, C represents the state cleaning process, W and R represent the writing and reading process, and MOT represents the cold atom preparation process).实验时序图 (图中Trig表示触发信号, C表示态清洗过程, W和R分别代表写过程与读过程, MOT代表冷原子制备过程)

Fig. 4. The retrieval efficiency as the function of optical depth.读出效率随光学厚度的变化

Fig. 5. The retrieval efficiency and as the function of power of read light field. 读出效率及 随读光功率变化

Fig. 6. The Bell parameter S as the function of quantum retrieval efficiency. Bell参量S随读出效率的变化