基于压缩光的量子激光雷达技术

利用Wigner函数对真空态、单光子态、压缩态在相空间的噪声分布进行仿真,并系统分析了基于压缩光的量子相干激光雷达和压缩光注入式量子激光雷达.研究表明,相比经典激光雷达,较高压缩度有利于量子相干激光雷达探测信噪比的提升,理论上8dB的压缩度可以使信噪比提高6.25倍;而压缩光注入式量子激光雷达系统的空间分辨率主要取决于真空压缩光的压缩度和无噪声相敏放大系统的增益.由于压缩光对探测信噪比的提升作用,量子激光雷达在微弱信号探测和高分辨率成像领域具有显著优势.

Quantum Lidar Based on Squeezed Sates of Light

The simulations of the noise distribution of vacuum state,single photon state and squeezed state in phase space were presented by Wigner function,respectively and the technology of the quantum lidar based on the squeezed field was systematically analyzed,including quantum coherent lidar and quantum lidar with squeezed light injection.Compared to the classical lidar,a higher squeezing degree benefits improvement of the detection Signal-To-Noise Ratio (SNR) for quantum coherent lidar,and a squeezing degree of 8dB would afford a 6.25-fold improvement in SNR theoretically,while the quantum lidar with squeezed vacuum injection has higher spatial resolution,which depends on the squeezing level of the squeezed vacuum and the gain of the phase sensitive amplifier.The results show that the quantum lidar has obvious advantages in the fields of weak signal detection and high-resolution imaging as the improvements of the signal-to-noise by using squeezed light.