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Practical gigahertz quantum key distribution robust against channel disturbance

By Shuang Wang, Wei Chen, Zhen-Qiang Yin, De-Yong He, Cong Hui, Peng-Lei Hao, Guan-Jie Fan-Yuan, Chao Wang, Li-Jun Zhang, Jie Kuang, Shu-Feng Liu, Zheng Zhou, Yong-Gang Wang, Guang-Can Guo and Zheng-Fu Han

Abstract

Quantum key distribution (QKD) provides an attractive solution for secure communication. However, channel disturbance severely limits its application when a QKD system is transfered 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 hours, and a stable secure key rate of 306k bits/s over 7 days without active polarization alignment

Topics: Quantum Physics, Physics - Applied Physics
Publisher: 'The Optical Society'
Year: 2018
DOI identifier: 10.1364/OL.43.002030
OAI identifier: oai:arXiv.org:1805.09952

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