两种情形下两原子的纠缠演化特性

The Enatanglement Evolution of Two Entangled Two-level Atoms under Two Cases

通过negativity方法,研究了两个空间分离的纠缠二能级原子依次通过高Q粒子数场时,两个原子的纠缠演化特性,发现:初始原子状态和光场状态对两原子的纠缠有明显的影响.通过选择初始状态可以得到较长时间的最大纠缠.然后与两个纠缠原子同时在高Q粒子真空场时两原子纠缠的演化做了有意义的比较,结果表明:当反映原子初始状态的参数θ<π/2时,两种情形的纠缠演化趋势大致相同.当θ<π/2时,纠缠演化大不一样.

By the negativity method, we investigate the entanglement time evolution of two entangled two-level atoms that go through the high Q fields in the fock state one by one. The results show that initial states of the two atom and the field in the fock state have influences on the entanglement of two states and the two-atom quantum state will two atoms stay the largest entangled state longer when the initial condition is proper. Then we compare it with the ＇ entanglement evolution in the condition that the two atoms are laid in QED at the same time. The results show that when the parameters θ〈π/2,the evolution of the entanglement is similar,whil θ〈π/2 e, the evolution of the entanglement is different.