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Security analysis of continuous-variable quantum key distribution with imperfect Faraday mirror
Laser Physics Letters ( IF 1.7 ) Pub Date : 2019-10-17 , DOI: 10.1088/1612-202x/ab4995
Kexin Liang 1 , Zhengwen Cao 1 , Weiqi Liu 1 , Jiayao Wang 1 , Geng Chai 1 , Tongyi Zhang 2
Affiliation  

For the practical Faraday mirror (FM) in a continuous-variable quantum key distribution (CVQKD) system there exists a rotation angle deviation that can lead to a loss of photon number when a light message passes through the polarization beam splitter. Here we employ the entanglement-based model to research the influence of the FM's imperfection. Based on parameter estimation, the imperfection can introduce a loophole for Eve to obtain information. The secret key rate of the CVQKD will be impaired. Finally, a novel method is proposed to ensure system performance by compensating optical power, and we further study the relationship between the secret key rate and the modulation variance.

中文翻译:

不完美法拉第镜连续变量量子密钥分发的安全性分析

对于连续可变量子密钥分配 (CVQKD) 系统中的实用法拉第镜 (FM),存在旋转角偏差,当光信息通过偏振分束器时,会导致光子数损失。在这里,我们采用基于纠缠的模型来研究 FM 缺陷的影响。基于参数估计,该缺陷可以为 Eve 获取信息引入漏洞。CVQKD 的密钥率将受到影响。最后,提出了一种通过补偿光功率来保证系统性能的新方法,并进一步研究了密钥速率与调制方差之间的关系。
更新日期:2019-10-17
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