Liao Shengkai1; Lin Jin1; Ren Jigang1; Liu Weiyue1; Qiang Jia2; Yin Juan1; Li Yang1; Shen Qi1; Zhang Liang3; Liang Xuefeng4; Yong Hailin1; Li Fengzhi1; Yin Yayun1; Cao Yuan1; Cai Wenqi1; Zhang Wenzhuo1; Jia Jianjun2; Wu Jincai2; Chen Xiaowen2; Zhang Shancong4; Jiang Xiaojun5; Wang Jianfeng5; Huang Yongmei6; Wang Qiang6; Ma Lu7; Li Li1; Pan Gesheng1; Zhang Qiang1; Chen Yuao1; Lu Chaoyang1; Liu Naile1; Ma Xiongfeng3; Shu Rong3; Peng Chengzhi1; Wang Jianyu3; Pan Jianwei1
Source Publicationchinesephysicsletters
AbstractQuantum 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.
Funding Project[Technology and Engineering Center for Space Utilization Chinese Academy of Sciences, Chinese Academy of Sciences] ; [National Natural Science Foundation of China]
Document Type期刊论文
3.Shanghai Branch, CAS
Recommended Citation
GB/T 7714
Liao Shengkai,Lin Jin,Ren Jigang,et al. spacetogroundquantumkeydistributionusingasmallsizedpayloadontiangong2spacelab[J]. chinesephysicsletters,2017,34(9).
APA Liao Shengkai.,Lin Jin.,Ren Jigang.,Liu Weiyue.,Qiang Jia.,...&Pan Jianwei.(2017).spacetogroundquantumkeydistributionusingasmallsizedpayloadontiangong2spacelab.chinesephysicsletters,34(9).
MLA Liao Shengkai,et al."spacetogroundquantumkeydistributionusingasmallsizedpayloadontiangong2spacelab".chinesephysicsletters 34.9(2017).
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