Chin. Phys. Lett.  2020, Vol. 37 Issue (11): 110301    DOI: 10.1088/0256-307X/37/11/110301
GENERAL |
A Fully Symmetrical Quantum Key Distribution System Capable of Preparing and Measuring Quantum States
Tianqi Dou , Jipeng Wang , Zhenhua Li , Wenxiu Qu , Shunyu Yang , Zhongqi Sun , Fen Zhou , Yanxin Han , Yuqing Huang , and Haiqiang Ma*
School of Science and State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
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Tianqi Dou , Jipeng Wang , Zhenhua Li  et al  2020 Chin. Phys. Lett. 37 110301
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Abstract 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.
Received: 17 July 2020      Published: 08 November 2020
PACS:  03.67.Dd (Quantum cryptography and communication security)  
  03.67.Hk (Quantum communication)  
  03.67.-a (Quantum information)  
Fund: Supported 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).
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http://cpl.iphy.ac.cn/10.1088/0256-307X/37/11/110301       OR      http://cpl.iphy.ac.cn/Y2020/V37/I11/110301
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Tianqi Dou 
Jipeng Wang 
Zhenhua Li 
Wenxiu Qu 
Shunyu Yang 
Zhongqi Sun 
Fen Zhou 
Yanxin Han 
Yuqing Huang 
and Haiqiang Ma
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