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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.
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Received: 17 July 2020
Published: 08 November 2020
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| PACS: |
03.67.Dd
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(Quantum cryptography and communication security)
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03.67.Hk
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(Quantum communication)
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03.67.-a
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(Quantum information)
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| 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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