Han Xuan, Yong Hai-Lin, Xu Ping, Yang Kui-Xing, Li Shuang-Lin, Wang Wei-Yang, Xue Hua-Jian, Li Feng-Zhi, Ren Ji-Gang, Peng Cheng-Zhi, Pan Jian-Wei
Opt Express. 2020 Jan 6;28(1):369-378. doi: 10.1364/OE.28.000369.
High-fidelity transmission of polarization encoded qubits plays a key role in long distance quantum communication. By establishing the channel between ground and satellite, the communication distance can even exceed thousands of kilometers. Aimed to achieve the efficient uplink quantum communication, here we describe a high-fidelity polarization design of a transmitting antenna with an average polarization extinction ratio of 887:1 by a local test. We also implement a feasible polarization-compensation scheme for satellite motions with a fidelity exceeding 0.995 ± 0.001. Based on these works, we demonstrate the ground-to-satellite entanglment distribution with a violation of Bell inequality by 2.312±0.096, which is well above the classic limit 2.
偏振编码量子比特的高保真传输在长距离量子通信中起着关键作用。通过建立地面与卫星之间的信道，通信距离甚至可以超过数千公里。为了实现高效的上行量子通信，我们在此描述一种发射天线的高保真偏振设计，通过本地测试，其平均偏振消光比为887:1。我们还针对卫星运动实现了一种可行的偏振补偿方案，保真度超过0.995±0.001。基于这些工作，我们展示了地面到卫星的纠缠分发，违反贝尔不等式的程度为2.312±0.096，远高于经典极限2。
