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arXiv 2402.08028quant-ph
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具有无界脉冲相关性的量子密钥分发

Quantum key distribution with unbounded pulse correlations

Margarida Pereira, Guillermo Currás-Lorenzo, Akihiro Mizutani, Davide Rusca, Marcos Curty, Kiyoshi Tamaki

AI总结:

针对量子密钥分发中无界脉冲相关性问题,提出一种通用形式体系将现有安全证明扩展至无界长度相关性场景,显著增强了安全证明的适用性和QKD实现安全的鲁棒性。

摘要:

量子密钥分发(QKD)实际应用中的一个普遍问题是发射信号之间出现相关性。尽管最近的研究证明了存在这种缺陷时QKD的安全性,但它们基于脉冲相关性具有有限长度的前提。然而,这一假设在实践中不一定成立,因为这些相关性的长度可能是无界的。事实上,第一个发射的脉冲可能与最后一个相关,即使非常微弱。不过,直觉上应该存在一个脉冲间隔阈值,超过该阈值后这些相关性变得极小以至于基本可忽略,从安全角度来看变得无关紧要。基于这一见解,我们引入了一种通用形式体系,旨在将现有的安全证明扩展到脉冲相关性具有无界长度的实际相关场景。这种方法显著增强了这些证明的适用性以及QKD实现安全的鲁棒性。

英文摘要:

A prevalent issue in practical applications of quantum key distribution (QKD) is the emergence of correlations among the emitted signals. Although recent works have proved the security of QKD in the presence of this imperfection, they rest on the premise that pulse correlations are of finite length. However, this assumption is not necessarily met in practice, since the length of these correlations could be potentially unbounded. Indeed, the first emitted pulse could be correlated with the last one, even if very faintly. Still, intuitively, there should exist a pulse separation threshold after which these correlations become so small as to be essentially negligible, rendering them inconsequential from a security standpoint. Building on this insight, we introduce a general formalism designed to extend existing security proofs to the practically relevant scenario in which pulse correlations have an unbounded length. This approach significantly enhances the applicability of these proofs and the robustness of QKD's implementation security.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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