基于量子照明的导航测距方案  

Navigation Ranging Scheme Based on Quantum Illumination

作　　者：惠俊 柴洪洲 Hui Jun;Chai Hongzhou(College of Geospatial Information,PLA Strategic Support Force Information Engineering University,Zhengzhou 450001,Henan,China)

机构地区：[1]中国人民解放军战略支援部队信息工程大学地理空间信息学院,河南郑州450001

出　　处：《光学学报》2023年第1期244-255,共12页Acta Optica Sinica

摘　　要：针对以往脉冲纠缠测距方案对光子损耗十分敏感的特点及量子干涉法测距中利用光路延迟测距时难以实现远距离传输的问题,利用量子压缩效应来提升时延估计精度,同时还提出一种基于量子照明原理的非经典纠缠导航测距方案,对目标存在的回波信号进行统计判断,从而确定距离参数。在相干探测的基础上,分别研究了相干态、热态和压缩态等3种高斯量子态的统计特性,并对量子照明测距方案中经典相干态与双模压缩真空态的信号检测性能进行了理论分析和数值模拟实验。结果表明,相较于传统测距方法,利用量子信号压缩和纠缠特性的方法能有效提高导航测距的距离分辨率,性能上优于经典方案,且在噪声光子数较多时具有更强的抗环境干扰能力。Objective As the basic technology for positioning and navigation of unknown targets, ranging technology is closely related to people′s life, national defense construction, aerospace exploration, and other aspects. The traditional positioning system can realize navigation ranging by continuously transmitting electromagnetic pulses into space, and the pulses will be reflected to the receiver as the presence of targets. As a result, we can detect the echo pulse and estimate its time delay through the propagation time. Wider bandwidth and greater transmission power of a transmitted electromagnetic pulse signal indicate higher precision of time accuracy. However, due to the restriction of the energy and bandwidth of the electromagnetic pulse, the accuracy of navigation ranging has certain limits. To go beyond the limits of energy, bandwidth, and accuracy in classical measurement, quantum ranging makes use of the entangled state, squeezed state, as well as other characteristics to make the transmitted quantum information have a strong correlation and high density. It can obtain much higher ranging accuracy(Heisenberg limit) than that of classical radio ranging systems, and thus it can be further applied to systems such as navigation, positioning, and gravitational wave measurement. In view of the problem that many previous ranging schemes are highly sensitive to photon loss and that it is difficult to achieve longdistance transmission through quantum interferometry, we use the squeezed state to improve the peak estimation of the time delay and propose a non-classical navigation ranging scheme based on quantum illumination, which makes a statistical judgment on the echo signal of a target to determine the distance parameter. We hope that our study can be helpful for the application of quantum information and the design of future navigation and positioning systems.Methods The quantum ranging scheme enhanced by Gaussian entanglement can be used for high-precision navigation ranging, whose form is similar to that of the

关 键 词：量子光学 无线电导航 量子照明 量子纠缠 压缩态 脉冲测距 

分 类 号：O431[机械工程—光学工程]