Least Square Algorithm for Phase Estimation in Continuous-Variable Quantum Key Distribution

被引：0
|
作者：
Huang Biao [1 ,2 ,3 ,4 ]
Ma Tiantian [4 ]
Huang Yongmei [1 ,3 ]
Peng Zhenming [2 ]
机构：
[1] Chinese Acad Sci, Inst Opt & Elect, Key Lab Opt Engn, Chengdu 610209, Sichuan, Peoples R China
[2] Univ Elect Sci & Technol China, Sch Informat & Commun Engn, Chengdu 610054, Sichuan, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[4] Southwest Commun Inst, Dept Basic Platform, Chengdu 610041, Sichuan, Peoples R China
来源：
LASER & OPTOELECTRONICS PROGRESS | 2021年 / 58卷 / 11期
关键词：
quantum optics; quantum communication; continuous variable; quantum key distribution; reference phase; least square estimation; PRACTICAL SECURITY;
D O I：
10.3788/LOP202158.1127001
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
To improve the accuracy of reference phase estimation the continuous-variable quantum key distrihution, a scheme of reference phase estimation is proposed, which is based on the least square method. Utilizing the second-order correlation characteristics of slow phase drift and the least-square estimation theory, the phase measurement results for a group of reference pulses are fitted by a quadratic polynomial at the receiver to suppress the effect of phase noise. The simulation results show that the least square phase estimation algorithm, compared with the block-averaging estimation algorithm, is Fetter adapted to phase drift variation, so that the mean square error of reference phase estimation can he reduced and the secret key rate of the practical system can he improved significantly.
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页数：6
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