A new optical field state as an output of diffusion channel when the input being number state

查看全文 作　　者：FAN [1]HongYi;LOU [1]SenYue;PAN [1]XiaoYin;HU [2]LiYun 机构地区：[1]Department of Physics, Ningbo University;[2]Department of physics, Jiangxi Normal University 出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2014年第57卷第9期,共5页 基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11175113 and 11264018);the Natural Science Foundation of Jiangxi Province of China(Grant No 20132BAB212006) 摘　　要：By analyzing theoretical scheme of quantum controlling through photon addition,we propose a new optical field whose density operator asρ=λ(1-λ)l:Ll(-λ2aa/1-λ)e-λaa:(here::denotes normal ordering symbol),which is named Laguerre-polynomialweighted chaotic state.We show that such state is the solution to the master equation d/dtρ=-κ(aaρ+ρaa-aρa-aρa),describing a diffusion channel,with the initial number state|l l|,andλ=1/(1+κt).This new state is characteristic of possessing photon number l+κt at time t,so the photon number by adjusting the diffusion parameterκcan be controlled.This master equation is solved using the summation method within ordered product of operators and the entangled state representation.The physical difference between the diffusion and the amplitude damping is noted. 关 键 词：状态输出 扩散通道 光场 输入 控制理论 纠缠态表象 光子数 混沌状态