Practical gigahertz quantum key distribution robust against channel disturbance

Quantum key distribution (QKD) provides an attractive solution for secure communication. However, channel disturbance severely limits its application when a QKD system is transferred from the laboratory to the field. Here a high-speed Faraday-Sagnac-Michelson QKD system is proposed that can automati...

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Bibliographic Details
Published inOptics letters Vol. 43; no. 9; p. 2030
Main Authors Wang, Shuang, Chen, Wei, Yin, Zhen-Qiang, He, De-Yong, Hui, Cong, Hao, Peng-Lei, Fan-Yuan, Guan-Jie, Wang, Chao, Zhang, Li-Jun, Kuang, Jie, Liu, Shu-Feng, Zhou, Zheng, Wang, Yong-Gang, Guo, Guang-Can, Han, Zheng-Fu
Format Journal Article
LanguageEnglish
Published United States 01.05.2018
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Summary:Quantum key distribution (QKD) provides an attractive solution for secure communication. However, channel disturbance severely limits its application when a QKD system is transferred from the laboratory to the field. Here a high-speed Faraday-Sagnac-Michelson QKD system is proposed that can automatically compensate for the channel polarization disturbance, which largely avoids the intermittency limitations of environment mutation. Over a 50 km fiber channel with 30 Hz polarization scrambling, the practicality of this phase-coding QKD system was characterized with an interference fringe visibility of 99.35% over 24 h and a stable secure key rate of 306 k bits/s over seven days without active polarization alignment.
ISSN:1539-4794
DOI:10.1364/OL.43.002030