1002 km twin-field quantum key distribution with finite-key analysis

Quantum Frontiers Pub Date : 2023-11-24 DOI:10.1007/s44214-023-00039-9

Yang Liu, Wei-Jun Zhang, Cong Jiang, Jiu-Peng Chen, Di Ma, Chi Zhang, Wen-Xin Pan, Hao Dong, Jia-Min Xiong, Cheng-Jun Zhang, Hao Li, Rui-Chun Wang, Chao-Yang Lu, Jun Wu, Teng-Yun Chen, Lixing You, Xiang-Bin Wang, Qiang Zhang, Jian-Wei Pan

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Abstract

Quantum key distribution (QKD) holds the potential to establish secure keys over long distances. The distance of point-to-point QKD secure key distribution is primarily impeded by the transmission loss inherent to the channel. In the quest to realize a large-scale quantum network, increasing the QKD distance under current technology is of great research interest. Here we adopt the 3-intensity sending-or-not-sending twin-field QKD (TF-QKD) protocol with the actively-odd-parity-pairing method. The experiment demonstrates the feasibility of secure QKD over a 1002 km fibre channel considering the finite size effect. The secure key rate is \(3.11\times 10^{-12}\) per pulse at this distance. Furthermore, by optimizing parameters for shorter fiber distances, we conducted performance tests on key distribution for fiber lengths ranging from 202 km to 505 km. Notably, the secure key rate for the 202 km, the normal distance between major cities, reached 111.74 kbps.

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1002公里双场量子密钥分布与有限密钥分析

量子密钥分发(QKD)具有在长距离上建立安全密钥的潜力。点对点QKD安全密钥分发的距离主要受到信道固有的传输损耗的阻碍。在实现大规模量子网络的过程中，在现有技术条件下增加量子密钥分配距离具有重要的研究意义。本文采用主动奇偶配对方法的3强度发送或不发送双域QKD (TF-QKD)协议。实验证明了在考虑有限尺寸效应的1002 km光纤通道上安全量子密钥分配的可行性。在此距离上，安全密钥速率为每脉冲\(3.11\times 10^{-12}\)。此外，通过优化较短光纤距离的参数，我们对光纤长度从202公里到505公里的关键分布进行了性能测试。特别是，主要城市之间的正常距离202公里的安全密钥速率达到了111.74 kbps。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Quantum Frontiers

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