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(87Rb)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1 dB。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75 μs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(87Rb)vapor. The squeezed degree in steady squeezed state is -1.1 dB. 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 75 μs. 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.