| 地球同步轨道星地量子信道特性研究 |
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| 引用本文： | 孙晓洁,王学锋,刘院省,王巍,董鹏,阚宝玺.地球同步轨道星地量子信道特性研究[J].宇航学报,2021,42(7):934-938. |
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| 作者姓名： | 孙晓洁 王学锋 刘院省 王巍 董鹏 阚宝玺 |
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| 作者单位： | 1. 北京航天控制仪器研究所，北京 100039；
2.中国航天科技集团有限公司量子工程研究中心，北京 100094；
3.中国航天科技集团有限公司，北京 100037 |
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| 摘 要： | 为了研究地球同步轨道量子密钥分发过程中星地量子信道特性，项目团队研制了搭载于实践二十卫星的极弱光偏振态分发设备，开展了地球同步轨道卫星与地面间光子偏振态的传输实验。实验时，星载偏振光分发设备根据遥控指令以50MHz频率驱动四个激光器出光，分发|0〉、|π/2〉、|π/4〉和|3π/4〉四种偏振态光子，经过长距离的空间传输后由地面站望远镜接收，最后由超导探测器探测。研究结果表明，地球同步轨道卫星到地面站的光学链路衰减约为100~110 dB，通道误码率约为2%~8%，满足量子密钥分发误码率的安全性要求。
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| 关 键 词： | 地球同步轨道卫星 量子密钥分发 极弱光 偏振态传输 |
| 收稿时间： | 2021-06-02 |
Research on GEO Satellite to Ground Quantum Channel Characteristics |
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| SUN Xiao jie,WANG Xue feng,LIU Yuan xing,WANG Wei,DONG Peng,KAN Bao xi.Research on GEO Satellite to Ground Quantum Channel Characteristics[J].Journal of Astronautics,2021,42(7):934-938. |
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| Authors: | SUN Xiao jie WANG Xue feng LIU Yuan xing WANG Wei DONG Peng KAN Bao xi |
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| Affiliation: | 1. Beijing Institute of Aerospace Control Devices, Beijing 100039, China; 2. Quantum Engineering Research Center, China Aerospace Science and Technology Corporation, Beijing 100094, China; 3. China Aerospace Science and Technology Corporation, Beijing 100037, China |
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| Abstract: | In order to study the quantum channel characteristics of GEO satellite to ground quantum key distribution, we design a photon polarization transmission device using the extremely weak light mounted on the SJ 20 satellite to carry out the experiment. In our experiment, the satellite payload sends 50MHz pulse light with four polarization states, such as |0〉、|π/2〉、|π/4〉and |3π/4〉, according to the experimental process. Then the pulse light transmitted along the long distance free space is received by the ground telescope and detected by the superconducting nanowire single photon detector. The results show that the optical attenuation between the GEO satellite and the ground station is 100~110 dB and the channel bit error rate is 2%~8%, which meet the security criteria of quantum key distribution. |
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