多光子非线性过程中的振幅平方压缩

Amplitude-squared squeezing in multiphoton nonlinear processes

本文研究了多光子非线性光学过程中的振幅平方压缩,证明了K光子么正算符 S_k(z)(K>2)对非真空相干态的作用在—级近似下会产生振幅平方压缩.以及S_k(z)(K>2,K≠4)对真空态的作用不会产生振幅平方压缩.发现4个光子么正算符S_4(z)对真空态的作用可以产生振幅平方压缩,这表明振幅平方压缩是一种独立于二阶压缩、反聚束以及亚泊松统计分布的新的光场非经典效应.

In this paper the amplitude-squared squeezing in the multiphoton nonlinear optical processes is studied. It is examined that amplitude-squared squeezing can be created in the first order approximation by k-photon unitary operators Sk(z) (K> 2) acting on the coherent state |α>(|α|≠0) and one can not be created by Sk(z) (K >2, K≠4) acting on the vacuum state. It is found that amplitude-squared squeezing can be created by 4-photon unitary operator S4(z) acting on the vacuum state and this shows that the amplitude-squared squeezing is a new nonclassioal effect of light field which is independent of the second order squeezing, antibunohing and sub-Poisson statistics.