基于压缩态光场的量子增强型光学相位追踪  

Quantum-enhanced optical phase tracking via squeezed state

作　　者：孙小聪 李卫 王雅君[2] 郑耀辉[2] Sun Xiao-Cong;Li Wei;Wang Ya-Jun;Zheng Yao-Hui(Shanxi Province Engineering Research Center of Precision Measurement and Online Detection Equipment,Shanxi Center of Technology Innovation for Light Manipulations and Applications,School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,China;State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]太原科技大学应用科学学院,山西省精密测量与在线检测装备工程研究中心,山西省光场调控与融合应用技术创新中心,太原030024 [2]山西大学光电研究所,量子光学与光量子器件国家重点实验室,太原030006

出　　处：《物理学报》2024年第5期127-132,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:62225504,62027821,62035015,U22A6003,12174234,12274275,12304403);国家重点研发计划(批准号:2020YFC2200402);山西省重点研发计划(批准号:202102150101003)资助的课题.

摘　　要：量子增强型光学相位追踪作为高精度跟踪和测量光学相位的量子光学技术,在目标定位、量子测距以及相控阵雷达和唢呐等领域中有着重要应用.本文提出一种基于压缩态光场的量子增强型光学相位追踪协议.采用中心波长为1064 nm的连续固体激光光源,结合光学参量振荡器以及Pound-Drever-Hall(PDH)锁定技术,制备得到初始压缩度为(8.0±0.2)dB的相位压缩态光场.通过信号调制及解调技术,实现对压缩态光场相位的控制,从而实现对光学相位0-2π范围内的量子增强型追踪.与经典协议相比,这一协议可以将相位追踪的噪声起伏抑制至散粒噪声基准以下至少6.27 dB,实现了相位追踪精度至少76.4%的量子增强.由于到达角估计、相控阵雷达、相控阵唢呐等应用领域对相位测量精度要求极高,这一协议有望将相位估计的精度提高至突破散粒噪声极限,为相关领域提供压缩光源,也为更高精度的空间定位及量子测距技术提供理论和实验基础.Quantum-enhanced optical phase tracking is a quantum optical technique for tracking and measuring optical phases with high accuracy.It has important applications in laser interferometry,spectral analysis,and optical measurements.In this study,we propose a quantum-enhanced optical phase tracking protocol based on squeezed state optical fields.By using a continuous solid-state laser source with a central wavelength of 1064 nm,combing second harmonic generation,optical parametric oscillator,and PDH(Pound-Drever-Hall)locking technology,we prepare an initial squeezed state with a squeezing level of(8.0±0.2)dB.Through signal modulation technique and demodulation technique,we control the phase of the squeezed state optical field,thereby realizing the quantum-enhanced tracking of optical phases within the range of 0-2π.Compared with classical protocols,this protocol can suppress the noise fluctuations of phase tracking to at least 6.27 dB below the shot noise limit,improving the phase tracking accuracy by more than 76.4%.Because of the high requirements for phase measurement accuracy in applications such as angle estimation,phased array radar,and phased array sonar,this protocol is expected to improve the phase estimation accuracy beyond the shot noise limit.It provides compressed light sources for relevant fields,laying a theoretical and experimental foundation for higher-precision spatial positioning and quantum ranging techniques.The probe is made of amino acids arranged in a linear chain and joined together by peptide bonds between the carboxyl and amino groups of adjacent amino acid residues.The sequence of amino acids in a protein is determined by a gene and encoded in the genetic code.This can happen either before the protein is used in the cell,or as part of control mechanism.

关 键 词：光学参量振荡 压缩态光场 相位估计 光学相位追踪 

分 类 号：O431.2[机械工程—光学工程]