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

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.