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Satellite-to-ground quantum key distribution
Liao, Sheng-Kai1,2; Cai, Wen-Qi1,2; Liu, Wei-Yue1,2; Zhang, Liang2,3; Li, Yang1,2; Ren, Ji-Gang1,2; Yin, Juan1,2; Shen, Qi1,2; Cao, Yuan1,2; Li, Zheng-Ping1,2; Li, Feng-Zhi1,2; Chen, Xia-Wei1,2; Sun, Li-Hua1,2; Jia, Jian-Jun3; Wu, Jin-Cai3; Jiang, Xiao-Jun4; Wang, Jian-Feng4; Huang, Yong-Mei5; Wang, Qiang5; Zhou, Yi-Lin6; Deng, Lei6; Xi, Tao7; Ma, Lu8; Hu, Tai9; Zhang, Qiang1,2; Chen, Yu-Ao1,2; Liu, Nai-Le1,2; Wang, Xiang-Bin2; Zhu, Zhen-Cai6; Lu, Chao-Yang1,2; Shu, Rong2,3; Peng, Cheng-Zhi1,2; Wang, Jian-Yu2,3; Pan, Jian-Wei1,2
Source PublicationNature
Indexed BySCI ; Ei
AbstractQuantum key distribution (QKD) uses individual light quanta in quantum superposition states to guarantee unconditional communication security between distant parties. However, the distance over which QKD is achievable has been limited to a few hundred kilometres, owing to the channel loss that occurs when using optical fibres or terrestrial free space that exponentially reduces the photon transmission rate. Satellite-based QKD has the potential to help to establish a global-scale quantum network, owing to the negligible photon loss and decoherence experienced in empty space. Here we report the development and launch of a low-Earth-orbit satellite for implementing decoy-state QKD - a form of QKD that uses weak coherent pulses at high channel loss and is secure because photon-number-splitting eavesdropping can be detected. We achieve a kilohertz key rate from the satellite to the ground over a distance of up to 1,200 kilometres. This key rate is around 20 orders of magnitudes greater than that expected using an optical fibre of the same length. The establishment of a reliable and efficient space-to-ground link for quantum-state transmission paves the way to global-scale quantum networks. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
Keywordcommunication - electron - frequency-magnitude distribution - optical instrument - quantum mechanics - satellite data
Document Type期刊论文
Affiliation1.Department of Modern Physics, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei; 230026, China;
2.Chinese Academy of Sciences (CAS), Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai; 201315, China;
3.Key Laboratory of Space Active Opto-Electronic Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai; 200083, China;
4.National Astronomical Observatories, Chinese Academy of Sciences, Beijing; 100012, China;
5.Key Laboratory of Optical Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu; 610209, China;
6.Shanghai Engineering Center for Microsatellites, Shanghai; 201203, China;
7.State Key Laboratory of Astronautic Dynamics, Xi'an Satellite Control Center, Xi'an; 710061, China;
8.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi; 830011, China;
9.National Space Science Center, Chinese Academy of Sciences, Beijing; 100190, China
Recommended Citation
GB/T 7714
Liao, Sheng-Kai,Cai, Wen-Qi,Liu, Wei-Yue,et al. Satellite-to-ground quantum key distribution[J]. Nature,2017,549(7670):43-47.
APA Liao, Sheng-Kai.,Cai, Wen-Qi.,Liu, Wei-Yue.,Zhang, Liang.,Li, Yang.,...&Pan, Jian-Wei.(2017).Satellite-to-ground quantum key distribution.Nature,549(7670),43-47.
MLA Liao, Sheng-Kai,et al."Satellite-to-ground quantum key distribution".Nature 549.7670(2017):43-47.
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