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题名: Satellite-to-ground quantum key distribution
作者: Liao, Sheng-Kai; Cai, Wen-Qi; Liu, Wei-Yue; Zhang, Liang; Li, Yang; Ren, Ji-Gang; Yin, Juan; Shen, Qi; Cao, Yuan; Li, Zheng-Ping; Li, Feng-Zhi; Chen, Xia-Wei; Sun, Li-Hua; Jia, Jian-Jun; Wu, Jin-Cai; Jiang, Xiao-Jun; Wang, Jian-Feng; Huang, Yong-Mei; Wang, Qiang; Zhou, Yi-Lin; Deng, Lei; Xi, Tao; Ma, Lu; Hu, Tai; Zhang, Qiang; Chen, Yu-Ao; Liu, Nai-Le; Wang, Xiang-Bin; Zhu, Zhen-Cai; Lu, Chao-Yang; Shu, Rong; Peng, Cheng-Zhi; Wang, Jian-Yu; Pan, Jian-Wei
作者部门: 运控部/科学卫星综合运控中心
通讯作者: Peng, CZ ; Pan, JW (reprint author), Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China. ; Peng, CZ ; Pan, JW (reprint author), Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China. ; Peng, CZ ; Wang, JY ; Pan, JW (reprint author), Univ Sci & Technol China, CAS, Ctr Excellence & Synerget Innovat, Ctr Quantum Informat & Quantum Phys, Shanghai 201315, Peoples R China. ; Wang, JY (reprint author), Chinese Acad Sci, Shanghai Inst Tech Phys, Key Lab Space Act Optoelect Technol, Shanghai 200083, Peoples R China.
刊名: NATURE
ISSN号: 0028-0836
出版日期: 2017
卷号: 549, 期号:7670, 页码:43+
收录类别: SCI
项目资助者: Strategic Priority Research Program on Space Science, Chinese Academy of Sciences ; National Natural Science Foundation of China
英文摘要: Quantum 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.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6032
Appears in Collections:运控部/科学卫星综合运控中心_期刊论文

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