原子的初态和耦合强度对量子系统纠缠度的影响

Effects of Atomic Initial State and Coupling Intensity on Entanglement of the Quantum System

在两耦合二能级原子与单模光场相互作用系统中,利用部分转置矩阵负本征值方法,研究了原子初态及耦合强度对原子间纠缠度的影响.结果表明:两原子间纠缠呈现周期性振荡,随着原子初态θ增大,原子间纠缠时间变长,纠缠振幅也变大;随着两原子间的耦合强度增大,原子间纠缠的周期变大,次波变少.

In the system of two coupling two‐level atoms interacting with a single‐mode field ,effects of a‐tomic initial state and coupling intensity on the entanglement of the quantum system are investigated by the method of negative eigenvalue of the partial transposition matrix .The results demonstrate that the en‐tanglement between the two atoms shows a periodical oscillation ,that the entanglement time between the atoms becomes longer and its amplitude becomes larger with increasing atomic initial state θ,and that the entanglement periodicity between the atoms becomes larger and the subwave diminishes with increasing a‐tomic coupling intensity .