原理验证型长距离萨格纳克双场量子密钥分发网络
Proof-of-principle long-distance Sagnac twin-field quantum key distribution network
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中文总结 AI 辅助
本研究实验演示了无需主动相位稳定或后补偿的127公里三用户对萨格纳克TFQKD网络，获93±1%干涉可见度与1.398×10⁻⁵比特每脉冲密钥率，为长距离QKD网络提供实用低成本方案。
中文摘要 AI 辅助
双场量子密钥分发（TFQKD）因在大信道损耗下性能优异，为长距离QKD网络提供了极具前景的方案。但受专用硬件要求限制，几乎所有长距离TFQKD演示仅实现两个用户间的密钥交换，而非三个及以上用户的网络。本研究中，我们利用单光子雪崩探测器，在无需任何主动相位稳定或后补偿的条件下，实验演示了一个跨度127公里的三用户对萨格纳克TFQKD网络。我们采用高效程序维持偏振稳定性并规避瑞利背散射噪声，实现了一小时内稳定的萨格纳克干涉可见度达93±1%。在包含102公里光纤、总损耗45分贝的非对称通信信道上，我们获得了1.398×10⁻⁵比特每脉冲的安全密钥率。据我们所知，这是首个无需主动相位稳定或后补偿、在长光纤上实现的TFQKD网络。我们的结果为长距离QKD网络提供了一种高度实用且成本效益高的方案。
英文摘要
Twin-field (TF) quantum key distribution (QKD) offers a promising approach to long-distance QKD networks due to its superior performance over large channel losses. Due to specialized hardware requirements, nearly all long-distance TFQKD demonstrations have only two users exchanging keys, rather than a network with three or more users. In this work, we experimentally demonstrate a proof-of-principle three-user-pair Sagnac TFQKD network spanning 127-km using single-photon avalanche detectors without any active phase stabilization or postcompensation. We implement efficient procedures for maintaining polarization stability and circumventing Rayleigh backscattering noise to achieve a stable Sagnac interference visibility of $93\pm1$% over one hour. A secure key rate of $1.398\times10^{-5}$ bits per pulse is achieved over an asymmetric communication channel with 102-km fiber and 45-dB overall loss. To our knowledge, this is the first TFQKD network without active phase stabilization or postcompensation achieved over long fibers. Our results represent a highly practical and cost-effective approach to long-distance QKD networks.
发表机构
- University of Toronto（多伦多大学）
- National Tsing Hua University（国立清华大学）
- National University of Singapore（新加坡国立大学）
- Quantum Bridge Technologies, Inc.（量子桥科技有限公司）
机构由 AI 辅助整理，请以论文原文为准。
