Practical Analysis of Continuous-Variable Quantum Key Distribution Using a Nondeterministic Noiseless Linear Amplifier

被引：2
作者：
Bai, Dongyun [1 ,2 ]
Huang, Peng [1 ,2 ]
Ma, Hongxin [1 ,2 ,3 ]
Wang, Tao [1 ,2 ]
Zeng, Guihua [1 ,2 ]
机构：
[1] Shanghai Jiao Tong Univ, State Key Lab Adv Opt Commun Syst & Networks, Shanghai Key Lab Nav & Locat Based Serv, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Ctr Quantum Informat Sensing & Proc, Shanghai 200240, Peoples R China
[3] Zhengzhou Informat Sci & Technol Inst, Zhengzhou 450004, Henan, Peoples R China
来源：
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS | 2018年 / 57卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Continuous variable; Quantum key distribution; Noiseless linear amplifier; Practical security; Finite-size effect; FIELD-TEST; DISTANCE; CRYPTOGRAPHY; IMPROVEMENT;
D O I：
10.1007/s10773-018-3826-z
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study the impact of the imperfections and the finite-size effect on the continuous-variable quantum key distribution (CVQKD) protocol with the nondeterministic noiseless linear amplifier (NLA). The imperfections of the homodyne detector and the imperfect amplification process as well as the finite-size effect on parameter estimation procedure are considered. We can see that despite the imperfections of the homodyne detector, the maximum improved transmission distance can still reach the equivalence of 20log(10)g dB losses theoretically. Moreover, the analysis shows the imperfect amplification process of the NLA will slightly decrease the performance of the system. And we find the finite-size effect significantly influence the secret key rates of the NLA CVQKD protocol and the performance will approach the ideal asymptotic case with the increase of block size.
引用
收藏
页码：3081 / 3097
页数：17
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