铷原子蒸汽中观测脉冲真空压缩态的建立  

Observation of Generation Process for a Pulsed Vacuum-squeezing Light in Hot Rubidium Vapor

作　　者：李政军[1] 郭进先 陈丽清[1] 

机构地区：[1]华东师范大学物理材料与科学学院,上海200241

出　　处：《量子光学学报》2017年第3期232-240,共9页Journal of Quantum Optics

基　　金：国家自然科学基金(No.91536114)

摘　　要：本论文提出并实验演示了一种系统由经典态进入到量子态演化过程的测量方法,对铷原子(87 Rb)蒸汽中,基于光偏振自旋转效应产生的脉冲真空压缩光的建立过程进行了研究,描述了脉冲光场从经典热态到真空压缩态的噪声涨落变化。脉冲真空压缩光的压缩度为-1.1dB。具体实验上,先采用平衡零拍探测方法测量了脉冲真空压缩光的正交分量,然后通过对正交分量做相位平均统计处理,得到了信号光场平均光子数随时间的变化分布,观测到75μs的压缩态建立时间。本文的实验方法为将来基于原子吸收线的短脉冲压缩光的产生打下实验基础,并为经典态和量子态的转换过程的研究提供一种可行的实验测量方案。This paper proposed and experimentally demonstrated a measurement method to observe the noise evolution of the optical signal from a classical state to a quantum state.This method is used to study the noise fluctuations with time of an optical signal,which is generated via polarization self-rotation effect in hot Rubidium（87 Rb）vapor.The squeezed degree in steady squeezed state is-1.1dB.The quadrature of the signal pulse was detected firstly using a balanced Homodyne detection.And the average photon number over time was achieved by phase-averaged statistics of the quadratures. We observed a squeezing establishing time of 75μs.This work will be useful for the generation of short squeezed pulse,and it will provide a method for studies in transition from classical state to quantum state.

关 键 词：脉冲真空压缩光 光偏振自旋转效应 相位平均统计法 平均光子数 噪音演化 

分 类 号：O562.4[理学—原子与分子物理]