基于纠缠相干态的量子照明雷达  被引量:3

Quantum illumination radar with entangled coherent states

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作  者:陶志炜 任益充 艾则孜姑丽·阿不都克热木 刘世韦 饶瑞中[2] Tao Zhi-Wei;Ren Yi-Chong;Abdukirim Azezigul;Liu Shi-Wei;Rao Rui-Zhong(School of Environmental Science and Optoelectronic Technology,University of Science and Technology of China,Hefei 230026,China;Key Laboratory of Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,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,合肥230026 [2]中国科学院合肥物质科学研究院安徽光学精密机械研究所,大气光学重点实验室,合肥230031

出  处:《物理学报》2021年第17期57-64,共8页Acta Physica Sinica

基  金:安徽省自然科学基金青年项目(批准号:1908085QA37);国家自然科学基金青年科学基金(批准号:11904369);脉冲功率激光技术国家重点实验室主任基金(批准号:2019ZR07)资助的课题.

摘  要:量子照明雷达旨在利用量子光场探测热噪声环境下低反射率目标是否存在.发射光源的纠缠特性使其较经典雷达具有独到的探测优势.纠缠相干态(entangled coherent state,ECS)作为一类在噪声环境下纠缠鲁棒性较强的量子态,近年来在量子科学的多个领域得到广泛的应用.本文研究了基于三类不同ECS态的量子照明雷达的目标探测性能,并以双模压缩态(two-mode squeezed vacuum state,TMSV)和相干态作为基准对比和分析了三类ECS态纠缠度大小与其探测性能之间的关系.研究发现:在目标为低反射率且发射光子数远小于背景噪声的情形下,三类ECS态的探测性能优于相干态,劣于TMSV态;此外,三类ECS态的探测性能可由其纠缠度的大小来决定.在其他照明条件下,使用量子照明雷达进行目标探测较相干态雷达并无明显的优势,三类ECS态的探测性能与TMSV态和相干态方案并无明显联系.There has been a great interest in quantum metrology(e.g.,quantum interferometric radar)due to its applications in sub-Rayleigh ranging and remote sensing.Despite interferometric radar has received vast amount of attentions over the past two decades,very few researches has been conducted on another type of quantum radar:quantum illumination radar,or more precisely quantum target detection.It is,in general,used to interrogate whether the low-reflectivity target in a noisy thermal bath is existed using quantum light.The entanglement properties of its emitted light source give it a unique detection advantage over the classical radar.Entangled coherent state(ECS),as a class of quantum states with high entanglement robustness in noisy environments,has been widely used in several fields of quantum science such as quantum informatics,quantum metrology.In this paper,we investigate the target detection performance of quantum illumination radar based on three different types of ECS states.We employ the two-mode squeezed vacuum state(TMSV)and the coherent state as benchmarks to compare and analyze the relationship between the entanglement strength of the three types of ECS states and their quantum illumination detection performance.We found that the detection performance of the three ECS states is better than that of the coherent state.However,it is inferior to that of the TMSV state when the target is of low reflectivity.The emitted photon number is much smaller than the background noise(we call this as“good”illumination conditions).On the contrary,quantum illumination radar has no obvious advantage over coherent state radar for target detection under other illumination conditions;further,the detection performance of these three types of ECS states is not evidently related to that of the TMSV state and the coherent state.Finally,we reveal that the target detection performance of quantum illumination for the first two types of ECS states can be determined by their entanglement strength under“good”illumination condit

关 键 词:量子照明 纠缠相干态 纠缠度 

分 类 号:O413[理学—理论物理] TN958[理学—物理]

 

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