通过市内自由空间量子信道分配纠缠和单光子
Distributing entanglement and single photons through an intra-city, free-space quantum channel
摘要：
我们已经将纠缠光子直接通过大气层分布到7.8公里外的接收站，在奥地利维也纳市的夜晚。从我们的纠缠对中检测到一个光子构成了来自发送者的触发单光子源。由于没有直接的时间稳定连接，这两个站通过计算公共互联网信道上共享的本地记录时间戳的互相关，在检测事件中发现了重合计数。在这个实验中，我们的量子信道总共维持了40分钟，在此期间，符合锁发现了大约60000个符合检测事件。在这些事件中的偏振相关产生的贝尔参数，S=2.27/pm 0.019，这违反了CHSH-贝尔不等式的14个标准偏差。这一结果对于高密度城市地区基于纠缠的自由空间量子通信是有希望的。这对于地面站和卫星之间的光量子通信也是令人鼓舞的，因为我们的自由空间链路的长度超过了大气层。
英文摘要：
We have distributed entangled photons directly through the atmosphere to a receiver station 7.8 km away over the city of Vienna, Austria at night. Detection of one photon from our entangled pairs constitutes a triggered single photon source from the sender. With no direct time-stable connection, the two stations found coincidence counts in the detection events by calculating the cross-correlation of locally-recorded time stamps shared over a public internet channel. For this experiment, our quantum channel was maintained for a total of 40 minutes during which time a coincidence lock found approximately 60000 coincident detection events. The polarization correlations in those events yielded a Bell parameter, S=2.27/pm0.019, which violates the CHSH-Bell inequality by 14 standard deviations. This result is promising for entanglement-based free-space quantum communication in high-density urban areas. It is also encouraging for optical quantum communication between ground stations and satellites since the length of our free-space link exceeds the atmospheric equivalent.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
