A Fully Symmetrical Quantum Key Distribution System Capable of Preparing and Measuring Quantum StatesSupported by the Fundamental Research Funds for the Central Universities (Grant No. 2019XD-A02), and the State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications (Grant No. IPO2019ZT06).,Chinese Physics Letters

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A Fully Symmetrical Quantum Key Distribution System Capable of Preparing and Measuring Quantum StatesSupported by the Fundamental Research Funds for the Central Universities (Grant No. 2019XD-A02), and the State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications (Grant No. IPO2019ZT06).
Chinese Physics Letters ( IF 3.5 ) Pub Date : 2020-11-25 , DOI: 10.1088/0256-307x/37/11/110301
Tianqi Dou , Jipeng Wang , Zhenhua Li , Wenxiu Qu , Shunyu Yang , Zhongqi Sun , Fen Zhou , Yanxin Han , Yuqing Huang , Haiqiang Ma

We propose a fully symmetrical QKD system that enables quantum states to be prepared and measured simultaneously without compromising system performance. Over a 25.6 km fiber channel, we demonstrate point-to-point QKD operations with asymmetric Mach–Zehnder interferometer modules. Two interference visibilities of above 99% indicate that the proposed system has excellent stability. Consequently, the scheme not only improves the feasibility of distributing secret keys, but also enables QKD closer to more practical applications.

更新日期：2020-11-25

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