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2017 Volume 34 Issue 9
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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. 2017: Space-to-Ground Quantum Key Distribution Using a Small-Sized Payload on Tiangong-2 Space Lab, Chinese Physics Letters, 34(9): 18-23. doi: 10.1088/0256-307X/34/9/090302
Citation: 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. 2017: Space-to-Ground Quantum Key Distribution Using a Small-Sized Payload on Tiangong-2 Space Lab, Chinese Physics Letters, 34(9): 18-23. doi: 10.1088/0256-307X/34/9/090302
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Space-to-Ground Quantum Key Distribution Using a Small-Sized Payload on Tiangong-2 Space Lab

  • Department of Modern Physics and Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026;Shanghai Branch, CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, Shanghai 201315

  • Key Laboratory of Space Active Opto-Electronic Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083

  • Shanghai Branch, CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, Shanghai 201315;Key Laboratory of Space Active Opto-Electronic Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083

  • Beijing UCAS Space Technology Co., Ltd, Beijing 100190

  • National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012

  • Key Laboratory of Optical engineering, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209

  • Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011

  • Shanghai Branch, CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, Shanghai 201315

  • Available Online: 30/12/2017
  • Fund Project: 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
  • 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 200mm.On the ground station,a telescope with an aperture of 1200mm 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 719km.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.
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Space-to-Ground Quantum Key Distribution Using a Small-Sized Payload on Tiangong-2 Space Lab

  • Available Online: 30/12/2017

Abstract: 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 200mm.On the ground station,a telescope with an aperture of 1200mm 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 719km.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.

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