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arXiv:1210.7556 · Nature Photonics

Direct and full-scale experimental verifications towards ground–satellite quantum key distribution

Jianyu Wang, Bin Yang, Sheng‐Kai Liao, Liang Zhang, Qi Shen, Xiaofang Hu, Jincai Wu, Shiji Yang, Hao Jiang, Yan-Lin Tang, Bo Zhong, Hao Liang, Wei-Yue Liu, Yihua Hu, Yongmei Huang, Bo Qi, Ji-Gang Ren, Ge-Sheng Pan, Juan Yin, Jianjun Jia, Yu-Ao Chen, Kai Chen, Cheng-Zhi Peng, Jian-Wei Pan

Published Apr 19, 2013• 308 citations
arXivHTMLPDF
DOI
10.1038/nphoton.2013.89

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The Micius satellite is the pioneering initiative to demonstrate quantum teleportation, entanglement distribution, quantum key distribution (QKD), and quantum-secured communications experiments at the global scale. In this work, we report on the results of the 600-mm-aperture ground station design which has enabled the establishment of a quantum-secured link between the Zvenigorod and Nanshan ground stations using the Micius satellite. As a result of a quantum communications session, an overall sifted key of 2.5 Mbits and a total final key length of 310 kbits have been obtained. We present an extension of the security analysis of the realization of satellite-based QKD decoy-state protocol by taking into account the effect of the detection-efficiency mismatch for four detectors. We also simulate the QKD protocol for the satellite passage and by that validate our semi-empirical model for a realistic receiver, which is in good agreement with the experimental data. Our results pave the way to the considerations of realistic imperfection of the QKD systems, which are important in the context of their practical security.