摘要
在马尔科夫环境下,利用共生纠缠度研究了耗散环境中耦合量子比特纠缠态及纠缠突然死亡的性质。研究结果表明:纠缠动力学演化与系统的温度、初始纠缠度及初始量子态密切相关;在一般情形下,由于环境的影响,纠缠突然死亡总会发生。通过数值模拟,发现存在一个特定的区域,此区域内系统的纠缠度衰减的很慢。在零温度近似下,给出了具体的纠缠突然死亡条件和计算纠缠突然死亡时间的表达式。
In Markovian environment, the nature of entanglement dynamics and entanglement sudden death of coupling qubits in the dissipative environment are investigated in detail using concurrence function. The results show that the dynamic evolution of entanglement is closely related with temperature of the system the initial entanglement and the initial quantum state. Under normal circumstances, entanglement sudden death always occurs due to environmental effect. A specific area is found through numerical simulation where the decay of entanglement is very slow. Under the zero-temperature approximation, the specific conditions of entanglement sudden death and the equation for calculating the time of entanglement sudden death are both given
出处
《量子电子学报》
CSCD
北大核心
2012年第6期701-707,共7页
Chinese Journal of Quantum Electronics
基金
国家自然科学基金(11164009)资助项目
