基于量子测量的Fock态制备和自相位调制的影响  

THE PREPARATION OF FOCK STATES BY QUANTUM MEASUREMENTS IN A KERR MEDIA AND THE INFLUENCE OF SELF-PHASE MODULATION

作　　者：周为[1] 薛秋寒 郭光灿[1] 

机构地区：[1]中国科学技术大学物理系,合肥230026

出　　处：《物理学报》1996年第8期1297-1303,共7页Acta Physica Sinica

基　　金：国家自然科学基金资助的课题

摘　　要：提出一种制备Fock态的新方案研究在包含有自相位调制的Kerr介质中两束光的相互作用,信号光场和探测光场初始处于相干态,经由非线性相互作用后演化成为纠缠态.若对探测光场的正交位相分量实行第一类量子测量,信号光场的光子数分布会受到调制.重复上述过程,发现信号光场最终演化成为一个纯的Fock态.这种制备Fock态的原理是基于互相位调制,而自相位调制则起着阻碍Fock态形成的作用.A scheme for the preparation of a Fock state is proposed. We study two lights interacting in a Kerr media with self-phase modulation. The signal light and the probe light whose initial states are both coherent states will be entangled via interaction, then when a quadrature component of the probe light is measured, the photon number distribution of the signal light is modulated. Repeating the process, we find the signal will collapse into a Fock state finally, and the physical principle of this evolution is based on the cross-phase modulation, the self-phase modulation may hinder the preparation of a Fock state.

关 键 词：量子测量 光场 FOCK态 自相位调制 

分 类 号：O431[机械工程—光学工程]