利用因式化纠缠模拟纠缠动力学行为的有效性研究  

On the validity of factorization law for the entanglement evolution of two qubits

作　　者：霍雅静[1] 李军刚[1] 

机构地区：[1]北京理工大学物理学院,北京100081

出　　处：《物理学报》2012年第21期50-56,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11005008;10974016);北京理工大学基础研究基金资助的课题~~

摘　　要：研宄了非马尔可夫噪声环境影响下两个量子比特纠缠的动力学行为.对比讨论了因式化纠缠在描述纠缠动力学演化的有效性.结果表明:对于贝尔态、最大纠缠混合态等特殊初态,当噪声环境的影响比较弱时,利用纠缠的因式化分解形式可以有效地刻画纠缠的动力学演化;对于一般初态的情况,当系统的纠缠比较大,噪声环境的影响比较弱时,纠缠的因式化分解形式也可以有效地刻画纠缠的动力学演化.The validity of factorization law for the entanglement evolution of two qubits coupled to two independent non-Markovian channels is investigated. It is found that for some initial states, such as the Bell state and the maximally entangled mixed state, the entanglement can be characterized by the factorized entanglement when the effects of the channels are weak. For the general initial states, the factorized entanglement provides us with a good approximation to characterize the entanglement dynamics when the entanglement is large.

关 键 词：量子纠缠 最大纠缠混合态 因式化纠缠 

分 类 号：O413.1[理学—理论物理]