摘要
研究了2个纠缠的Λ型三能级原子与双模量子腔场的喇曼耦合模型,利用部分转置矩阵负本征值的方法,计算了两原子纠缠随时间的演化。结果表明:两原子纠缠演化呈现周期性,并且演化规律受到两原子初始状态、腔模初始光子数的影响;对于特殊的原子初态,两原子会一直处于最大纠缠而与光场初始光子数无关;与Tavis-Cummings模型相比,本模型中两原子的纠缠可以保持更长时间。
We investigate the Raman coupled model of two entangled A-type three-level atoms interacting with a two-mode quantized cavity field. With the negative eignevalues of the partial transposition matrix,we obtain the time evolution of entanglement between the two atoms. The results show that the entanglement of the two atoms displays periodicity;the evolution regular of entanglement is influenced by the initial state of two atoms and initial photon number of the cavity. For special initial state,the two-atom quantum state will stay in the maximum entangled state forever and have no relation with the init/al photon number. Compared with Tavis-Commings mode/, the entanglement of the two atoms can live for much longer time in the proposed model.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2007年第7期859-862,共4页
Journal of Optoelectronics·Laser
基金
国家自然科学基金重点资助项目(10534030)
关键词
Λ型三能级原子
部分转置矩阵负本征值
量子纠缠
A-type three-level atoms
negative eigenvalues of the partial transposition matrix
quantum entanglement
