摘要
用VonNeumann熵研究了附加克尔介质的压缩真空场与二能级原子依赖强度耦合相互作用量子体系的量子纠缠特性 .讨论了初始压缩真空场的压缩度以及克尔非线性作用的强度对该量子体系纠缠特性的影响 .结果表明 ,克尔介质的非线性作用的强弱可以改变体系量子纠缠的周期性 ;在初始压缩度较大 (r =5 )时 ,克尔介质的非线性作用可导致原子与场持续地处于最大纠缠态 ,无消纠缠态或持续地处于消纠缠态 .
The properties of the entanglement in the intensity-dependent coupling interaction between squeezing vacuum state field and atom with an additional Kerr medium are investigated by using the von Neumann entropy. The influences of nonlinear interaction intensity of Kerr medium and the squeezing degree of initial squeezing vacuum state field on the entanglement of the quantum system are discussed. The results show that the nonlinear interaction of Kerr medium can result in the generation of the maximally entangled state, disentangled-free state or disentangled state, and the degree of entanglement is stationary.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第1期75-81,共7页
Acta Physica Sinica
基金
国家自然科学基金 (批准号 :10 0 740 72 )
湖北省高校科研基金重点项目 (批准号 :2 0 0 0B0 80 10 )资助的课题~~
