LUO Chengli,ZHANG Chunling.Entanglement dynamics for the macroscopic fields interacted withatoms under a huge photons number approximation[J].Journal of Yanbian University,2018,44(01):39-42.
大光子数近似下宏观场与原子相互作用系统的纠缠动力学
- Title:
- Entanglement dynamics for the macroscopic fields interacted with atoms under a huge photons number approximation
- Keywords:
- entangled coherent state; macroscopic field; entanglement dynamics; huge photons number approximation
- 分类号:
- O413.1
- 文献标志码:
- A
- 摘要:
- 研究初始时处于纠缠态的两个宏观场各自独立地与一个原子相互作用的系统的动力学特性,结果表明:当原子与场的作用时间t=(2n+1)π(n^-)1/2/g时,两个腔场间的纠缠将完全消失,即出现纠缠突然死亡现象(ESD),同时腔场与原子间也无任何纠缠; 当t=2n π(n^-)1/2/g时,腔场间完全消失掉的纠缠又重新恢复过来并达到最大纠缠,即出现纠缠突然产生现象(ESB); 腔场的平均光子数越大,纠缠保存得越久; 当腔场间的纠缠完全消失时,两个原子处在最大纠缠态上.通过引入3个近似,解决了无法刻画宏观场纠缠的困境,给出了宏观场纠缠的解析解,并通过与建立在Bell -CHSH不等式上的结果进行对比分析,证明了3个近似所带来的误差可以忽略不计.
- Abstract:
- We study the entanglement dynamics for two initially entangled coherent macroscopic fields each interacting with an atom. The results obtained by resolvable values show the entanglement of the two fields disappears when t=(2n+1)π(n^-)1/2/g and appears again when t=2n π(n^-)1/2/g. It is obviously that the field-field entanglement will increase with the mean photon number of the macroscopic field. Then we find that when the entanglement of the two fields disappears, the two-atom entanglement appears. By introducing 3 approximations, we can solve the difficult problem of describing the macroscopic field entanglement, and give the analytical solution of the macroscopic field entanglement. Compared with the results based on Bell -CHSH inequality, it is proved that the errors caused by the 3 approximations can be neglected.
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备注/Memo
收稿日期: 2017-09-02
基金项目: 福建省教育厅科学研究B类项目(JB14220)
作者简介: 罗成立(1986—),男,讲师,研究方向为量子光通信、物理电子学.