Dissipation of a two-mode squeezed vacuum state in the single-mode amplitude damping channel  

作　　者：周南润 胡利云 范洪义 

机构地区：[1]Department of Electronic Information Engineering,Nanchang University [2]School of Physics and Communication Electronics,Jiangxi Normal University [3]Department of Physics,Shanghai Jiao Tong University

出　　处：《Chinese Physics B》2011年第12期38-42,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 11047133 and 10647133);the Natural Science Foundation of Jiangxi Province of China (Grant Nos. 2009GQS0080 and 2010GQW0027);the Research Foundation of the Education Department of Jiangxi Province of China (Grant Nos. GJJ11339 and GJJ10097)

摘　　要：We explore how a two-mode squeezed vacuum state sechθeab tanh θ[00） evolves when it undergoes a single- mode amplitude dissipative channel with rate of decay k. We find that in this process not only the squeezing parameter decreases, tanhθ → e-kt tanh θ, but also the second-mode vacuum state evolves into a chaotic state exp{bbln[（1 - e-2kt） tanh2 θ]}. The outcome state is no more a pure state, but an entangled mixed state.We explore how a two-mode squeezed vacuum state sechθeab tanh θ[00） evolves when it undergoes a single- mode amplitude dissipative channel with rate of decay k. We find that in this process not only the squeezing parameter decreases, tanhθ → e-kt tanh θ, but also the second-mode vacuum state evolves into a chaotic state exp{bbln[（1 - e-2kt） tanh2 θ]}. The outcome state is no more a pure state, but an entangled mixed state.

关 键 词：amplitude dissipative channel two-mode squeezed vacuum state two-mode entangled state quantum communication 

分 类 号：O413.1[理学—理论物理]