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

被引：8
|
作者：
Zhou Nan-Run [1 ]
Hu Li-Yun [2 ]
Fan Hong-Yi [3 ]
机构：
[1] Nanchang Univ, Dept Elect Informat Engn, Nanchang 330031, Peoples R China
[2] Jiangxi Normal Univ, Sch Phys & Commun Elect, Nanchang 330022, Peoples R China
[3] Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200030, Peoples R China
来源：
CHINESE PHYSICS B | 2011年 / 20卷 / 12期
基金：
中国国家自然科学基金;
关键词：
amplitude dissipative channel; two-mode squeezed vacuum state; two-mode entangled state; quantum communication; DENSITY OPERATOR; REPRESENTATION;
D O I：
10.1088/1674-1056/20/12/120301
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We explore how a two-mode squeezed vacuum state sech theta e(alpha dagger b dagger tahh theta) |00 > evolves when it undergoes a single-mode amplitude dissipative channel with rate of decay.. We find that in this process not only the squeezing parameter decreases, tanh theta -> e(-kappa t) tanh theta, but also the second-mode vacuum state evolves into a chaotic state exp{b dagger b ln[(1 - e(-2 kappa t)) tanh(2)theta]}. The outcome state is no more a pure state, but an entangled mixed state.
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页数：5
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