利用准相位匹配技术和Sagnac环结构设计研制了一套高亮度、高稳定性、小型化、可移动式的一体化纠缠源系统.此纠缠源基于周期极化磷酸钛氧钾(PPKTP)晶体参量下转换过程, 亮度达到了13.8Mcps, 偏振对比度好于98%, 纠缠度达到0.9357, 温度变化和机械振动测试引起的计数率抖动小于5%.此系统成功地应用到了外场百公里量子纠缠分发和连续长时间关联速度下限测量试验中, 从而为进一步实现空间纠缠源载荷提供了良好的试验技术基础.

An integrated miniaturized portable entanglement source with high-brightness and high-stability has been designed using quasi-phase matching and Sagnac loop structure. Based on parametric down conversion process of PPKTP crystal, the entanglement source has the brightness of 13.8Mcps, the polarization contrast better than 98%, the tangle of 0.9357, and the jitter of counts rate caused by temperature variation and mechanical vibration less than 5%. The system has been successfully and effectively applied to the field test of 100km quantum entanglement distribution and lower-limit measurement of association speed under continuous running, which provides a good trial basis for further realizing the spatial entanglement source load.