量子电子学报2012，Vol.29Issue(4)：441-447,7.DOI:10.3969/j.issn.1007-5461.2012.04.010
Stark位移对混态J-C模型中熵和纠缠的影响
Influence of Stark shift on entropy and entanglement in J-C model with mixed states
摘要
Abstract
A two-level atom coupling with a single-mode thermal field through two-photon processes is considered. The reduced entropy change of the atom and field was studied by using quantum reduced entropy, and entanglement between the atom and field was measured by using concurrence. By means of numerical computation method, the effect of the Stark shift and mean photon number in J-C model with mixed states on the reduced entropy change and entanglement was investigated. The results show that reduced entropy changes of the atom and field decrease under the influence of Stark shift. When the initial parameters are suitable, the complete exchange between the atomic and field reduced entropy occurs. In addition, the minimum values of the entanglement raise in the presence of Stark shift, which means that the atom is no longer disentangled from the field.关键词
量子光学/纠缠/共生纠缠度/量子约化熵/Stark位移/Jaynes-Cummings模型Key words
quantum optics/ entanglement/ concurrence/ quantum reduced entropy/ Stark shift/ Jaynes-Cummings model分类
数理科学引用本文复制引用
胡要花..Stark位移对混态J-C模型中熵和纠缠的影响[J].量子电子学报,2012,29(4):441-447,7.基金项目
国家自然科学基金青年基金(10905028)、河南省科技计划(102300410050)资助项目 （10905028）
