大气湍流引起的相位起伏对相干态量子雷达相位估计的影响  

Influence of phase fluctuation by atmospheric turbulence on phase estimation of coherent state quantum radar

作　　者：陶志炜 王书 任益充 饶瑞中 TAO Zhiwei;WANG Shu;REN Yichong;RAO Ruizhong(School of Environmental Science and Optoelectronic Technology,University of Science and Technology of China,Hefei 230022,China;Key Laboratory of Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China;Science Island Branch of Graduate School,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学技术大学环境科学与光电技术学院,安徽合肥230022 [2]中国科学院安徽光学精密机械研究所大气光学重点实验室,安徽合肥230031 [3]中国科学技术大学研究生院科学岛分院,安徽合肥230026

出　　处：《国防科技大学学报》2020年第1期31-37,共7页Journal of National University of Defense Technology

基　　金：国家自然科学基金青年基金资助项目(11904369);安徽省自然科学基金青年科学基金资助项目(1908085QA37);中科院合肥物质科学研究院院长基金青年火花基金资助项目(YZJJ2018QN1);脉冲功率激光技术国家重点实验室主任基金资助项目(2019ZR07)

摘　　要：基于马赫曾德干涉仪模型并采用相位扩散主方程描述大气相位起伏效应对量子雷达的影响,给出了光场在相位扩散通道的演化过程,详细分析了大气相位起伏对相干态宇称探测量子雷达相位估计分辨率和最佳灵敏度的影响,并计算了大气相位起伏下相位估计灵敏度的Cramer-Rao极限。研究发现:相位起伏对于分辨率的影响可通过增加单个脉冲平均光子数来消除。在强相位起伏情况下,宇称探测得到最佳灵敏度会严重偏离散粒噪声极限,但是在弱相位起伏情况下,通过与Cramer-Rao极限的对比,发现宇称探测是一种准最佳探测方案。The Mach-Zehnder interferometer and phase-diffusion main equation were used to simulate the influence of atmospheric phase fluctuation on the quantum radar,and the evolution process under phase diffusion channel was solved. The influence of atmospheric phase fluctuation on the phase estimation resolution and optimal sensitivity of the coherent state parity probe quantum radar were thoroughly analyzed,and the Cramer-Rao limit of phase estimation sensitivity under atmospheric phase fluctuation was calculated. The study found that the effect of phase fluctuation on resolution can be eliminated by increasing the average number of photons per pulse. Moreover,in the case of strong phase fluctuation,the best sensitivity of parity detection may seriously deviate from the shot noise limit,but in the case of weak phase fluctuation,it is found that the parity detection is a quasi-optimal detection compared with the Cramer-Rao limit.

关 键 词：量子雷达 宇称探测 大气相位起伏 最佳灵敏度 Cramer-Rao极限 

分 类 号：O431.2[机械工程—光学工程]