摘要
在非旋波近似下,对双模相干态光场与A型三能级原子相互作用系统的量子纠缠进行了精确求解,讨论了平均光子数及失谐量对量子纠缠演化的影响。数值计算结果表明:量子纠缠的周期随平均光子数的增大而增大;量子纠缠最大值随失谐的增大逐渐降低,且达到最大值所需时间逐渐增加;当失谐较大时,量子纠缠在较短时间内具有较好的周期性;随着平均光子数及失谐的增大,虚光子效应使量子纠缠演化曲线小锯齿状的振荡逐渐增强。
Quantum entanglement of a two-mode coherent field interacting with a A-type three-level atom system is solved exactly without rotating wave approximation, and the influence of mean photon number and detuning on quantum entanglement evolution are discussed. Numerical results show that the quantum entanglement period increases with the increasing of mean photon number. The quantum entanglement maximum decreases gradually with increasing of detuning, and the time reaching the maximum increases gradually. When the detuning is relative large, the quantum entanglement has better periodicity in a relatively short period. The small zigzag shaped oscillation of quantum entanglement evolution curve due to virtual photon effect is gradually enhanced with the increasing of mean photon number and detuning.
作者
丛红璐
刘雪华
赵玉娜
于娜
任学藻
CONG Honglu1, LIU Xuehua1, ZHAO Yu＇na1, YU Na1, REN Xuezao2(1 Haibin College, Beijing Jiaotong University, Huanghua 061199, China;2 School of Science, Southwest University of Science and Technology, Mianyang 621010, China)
出处
《量子电子学报》
CAS
CSCD
北大核心
2018年第2期184-190,共7页
Chinese Journal of Quantum Electronics
基金
河北省高等学校科学技术研究青年基金
QN2017401
河北省创新能力提升计划软科学研究及科普专项
17K55304D
河北省实验教学示范中心建设项目~~
关键词
量子光学
量子纠缠
相干态正交化展开
三能级原子
非旋波近似
quantum optics
quantum entanglement
coherent-state orthogonalization expansion
three-level atom
without rotating wave approximation
