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Simple security proofs for continuous variable quantum key distribution with intensity fluctuating sources
npj Quantum Information ( IF 7.6 ) Pub Date : 2021-10-14 , DOI: 10.1038/s41534-021-00482-3
Chenyang Li 1, 2 , Li Qian 1 , Hoi-Kwong Lo 1, 2, 3
Affiliation  

Despite tremendous theoretical and experimental progress in continuous variable (CV) quantum key distribution (QKD), the security has not been rigorously established for most current continuous variable quantum key distribution systems that have imperfections. Among these imperfections, intensity fluctuation is one of the principal problems affecting security. In this paper, we provide simple security proofs for continuous variable quantum key distribution systems with intensity fluctuating sources. Specifically, depending on device assumptions in the source, the imperfect systems are divided into two general cases for security proofs. In the most conservative case, we prove the security based on the tagging idea, which is a main technique for the security proof of discrete variable quantum key distribution. Our proofs are simple to implement without any hardware adjustment for current continuous variable quantum key distribution systems. Also, we show that our proofs are able to provide secure secret keys in the finite-size scenario.



中文翻译:

具有强度波动源的连续可变量子密钥分发的简单安全证明

尽管在连续变量 (CV) 量子密钥分发 (QKD) 方面取得了巨大的理论和实验进展,但目前大多数存在缺陷的连续变量量子密钥分发系统的安全性尚未得到严格建立。在这些缺陷中,强度波动是影响安全的主要问题之一。在本文中,我们为具有强度波动源的连续可变量子密钥分发系统提供了简单的安全证明。具体来说,根据源中的设备假设,不完善的系统被分为安全证明的两种一般情况。在最保守的情况下,我们基于标签思想来证明安全性,这是离散可变量子密钥分发安全性证明的主要技术。我们的证明易于实现,无需对当前的连续可变量子密钥分发系统进行任何硬件调整。此外,我们表明我们的证明能够在有限大小的场景中提供安全的密钥。

更新日期:2021-10-14
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