自由空间量子通讯实验中纠缠源的研制

The design of entangled source for free space quantum communications

设计了适合自由空间量子通讯实验的纠缠源.纠缠光子对的单模光纤搜集率约为每秒20000对,水平竖直方向的纠缠对比度大于95%,正负45°方向的纠缠对比度大于90%.在本地得到了大于100个标准偏差的Bell不等式破缺.满足20km量级的自由空间量子通讯试验要求.

We design and build an entanglement source suitable for free space quantum communications experiment. The coincidence counting rate after single mode fiber is 20000 cps. The entanglement visibility is more than 95 % in horizontal vertical base and more than 90% in diagonal base. The Bell inequality was broken by more than 100 standard deviations in local experiment. The entanglement source satisfies the requirements for 20 km free space quantum communications experiment.