摘要
研究了由两个初始处于类贝尔纠缠态的二能级原子与双模粒子数场组成的相互作用系统中,腔场参量、环境及能量转移对两原子纠缠化特性的影响。结果表明:两原子之间的纠缠演化呈现周期性,两原子的纠缠初态、原子之间的偶极相互作用和双模粒子数场中的光子数对其有着显著的影响。同时发现当双模光场均为非真空场时,两原子的纠缠会出现猝死现象,原子之间的偶极相互作用对该现象的产生具有抑制作用,强偶极作用能维持两原子间的纠缠量一直保持比较大的状态。进一步分析了两原子子系统的纠缠演化与原子-光场纠缠演化的关系,指出纠缠猝死现象发生时所暂时失去的纠缠量被转移给了环境。在文末,对两原子子系统纠缠度随时间的变化与两原子能量变化之间的联系进行了比较直观的说明。
We mainly study the relationship between the atomic entanglement evolution and cavity parameters,environment and energy exchange in a system which consists of two Bell-like entangled two-level atoms and a dual-mode cavity field.The results show that the entanglement evolution of two atoms exhibits periodicity,and it is related to the atomic initial state,the dipole-dipole interaction and the photon number in the dual-mode cavity field.It is also found that atomic entanglement will undergo the entanglement sudden death（ESD） phenomenon if dual-mode cavity field is in the non-vacuum state.Dipole-dipole interaction between atoms can inhibit the emergence of this ESD phenomenon,and the stronger dipole-dipole interaction can maintain two atoms in the larger entanglement state.Then in this paper we also investigate the time variation relationship between the entanglement of atomic subsystem and the atom-field entanglement dynamics,and when the atomic entanglement shows ESD phenomenon,the energy is completely tranfered to the environments.At last,we make an intuitive explanation between the atomic entanglement evolution and the variation of atomic energy in this paper.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2010年第3期470-475,共6页
Journal of Optoelectronics·Laser
基金
国家自然科学基金资助项目(10774088)
关键词
纠缠动力学
纠缠猝死
双模粒子数场
部分转置矩阵负本征值
entanglement dynamics
entanglement sudden death
bimode particle number field
the negative eigenvalues of partially transpose matrix
