利用CHSH关联增强相干单向量子密钥分发的安全性
Enhancing the security of coherent one-way quantum key distribution using CHSH correlations
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中文总结 AI 辅助
本研究通过极小改动COW协议，利用CHSH关联监测量子关联以检测更多攻击，将其最大安全距离从不足20km延长至约259km，增强了该量子密钥分发协议的安全性。
中文摘要 AI 辅助
相干单向（COW）协议是一种量子密钥分发方案，已受到广泛关注，推动了实用化实现的开发与商业化。尽管取得了这些进展，但COW协议的安全性自提出以来始终是核心挑战。多年来众多研究对其安全性进行了探讨，也提出了若干安全性证明，不过近期多项研究对该协议的安全性提出了质疑，其中一项最新研究引入的攻击严重限制了COW-QKD的安全性，报告的最大安全距离不足20km。本研究对COW协议进行极小改动以提升其安全性，具体而言，不再监测连续脉冲间的相干性，而是提议通过贝尔不等式的违背来监测量子关联，该方法可检测更广泛的潜在攻击类型。仿真结果表明，采用该方法后，协议的最大安全距离可延长至约259km。
英文摘要
The coherent one-way (COW) protocol is a quantum key distribution scheme that has attracted significant attention, leading to the development and commercialization of practical implementations. Despite this progress, the security of the COW protocol has remained a fundamental challenge since its introduction. Numerous studies have investigated its security, and several security proofs have been proposed over the years. More recently, a number of works have questioned the security of this protocol. In particular, one of the latest studies introduced an attack that severely limits the security of COW-QKD and reported a maximum secure distance of less than 20km. In this work, we introduce minimal alteration to the COW protocol that can enhance its security. Specifically, instead of monitoring the coherence between successive pulses, we propose to monitor quantum correlations through the violation of Bell inequalities. This approach enables the detection of a broader class of potential attacks. Our simulation results indicate that, by employing this method, the maximum secure distance of the protocol can be extended to approximately 259km.
