Chin. Phys. Lett. 2017, Vol.34 Issue (9): 90302- DOI:10.1088/0256-307X/34/9/090302
Space-to-Ground Quantum Key Distribution Using a Small-Sized Payload on Tiangong-2 Space Lab
1Department of Modern Physics and Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 2300262Shanghai Branch, CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, Shanghai 2013153Key Laboratory of Space Active Opto-Electronic Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 2000834Beijing UCAS Space Technology Co., Ltd, Beijing 1001905National Astronomical Observatories, Chinese Academy of Sciences, Beijing 1000126Key Laboratory of Optical engineering, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 6102097Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011>
Quantum technology establishes a foundation for secure communication via quantum key distribution (QKD). In the last two decades, the rapid development of QKD makes a global quantum communication network feasible. In order to construct this network, it is economical to consider small-sized and low-cost QKD payloads, which can be assembled on satellites with different sizes, such as space stations. Here we report an experimental demonstration of space-to-ground QKD using a small-sized payload, from Tiangong-2 space lab to Nanshan ground station. The 57.9-kg payload integrates a tracking system, a QKD transmitter along with modules for synchronization, and a laser communication transmitter. In the space lab, a 50?MHz vacuum?+?weak decoy-state optical source is sent through a reflective telescope with an aperture of 200?mm. On the ground station, a telescope with an aperture of 1200?mm collects the signal photons. A stable and high-transmittance communication channel is set up with a high-precision bidirectional tracking system, a polarization compensation module, and a synchronization system. When the quantum link is successfully established, we obtain a key rate over 100?bps with a communication distance up to 719?km. Together with our recent development of QKD in daylight, the present demonstration paves the way towards a practical satellite-constellation-based global quantum secure network with small-sized QKD payloads.
Supported by China Manned Space Program, Technology and Engineering Center for Space Utilization Chinese Academy of Sciences, Chinese Academy of Sciences, and the National Natural Science Foundation of China.
- Sheng-Kai Liao, Jin Lin, Ji-Gang Ren, Wei-Yue Liu, Jia Qiang, Juan Yin, Yang Li, Qi Shen, Liang Zhang, Xue-Feng Liang, Hai-Lin Yong, Feng-Zhi Li, Ya-Yun Yin, Yuan Cao, Wen-Qi Cai, Wen-Zhuo Zhang, Jian-Jun Jia, Jin-Cai Wu, Xiao-Wen Chen, Shan-Cong Zhang, Xiao-Jun Jiang, Jian-Feng Wang, Yong-Mei Huang, Qiang Wang, Lu Ma, Li Li, Ge-Sheng Pan, Qiang Zhang, Yu-Ao Chen, Chao-Yang Lu, Nai-Le Liu, Xiongfeng Ma, Rong Shu, Cheng-Zhi Peng, Jian-Yu Wang, Jian-Wei Pan. Space-to-Ground Quantum Key Distribution Using a Small-Sized Payload on Tiangong-2 Space Lab[J]. CPL, 2017, 34(9): 90302-.