摘要
研究两能级原子与环境(热辐射场)简并双光子作用时采用非旋波近似,通过外加驱动场,分析置于热辐射场中的两能级原子约化密度算符非对角元的时间演化,得到原子在热辐射场中的相干特性。当外加驱动场的时间演化满足一定条件时,可保持两能级原子在双光子过程中的相干性。
The coherence of two-level atom in a thermal radiation field without rotating wave approximation through an external controllable driving field was investigated. The time evolution properties of non-opposite angle element of two-level atom's reducible density rectangular array was discussed. Coherence properties of two-level atom was studied in degenerate two-photon processes when the two-level atom interacts with an driving field in the thermal radiation field . We obtained the properties of an external driving field when two-level atom's coherence is maintained.
出处
《量子电子学报》
CAS
CSCD
北大核心
2004年第4期486-491,共6页
Chinese Journal of Quantum Electronics
基金
湖南省科技厅中青年科技基金(00JZY2136)
湖南省自然科学基金(02JJY2096)资助课题
关键词
量子光学
两能级原子
热辐射场
简并双光子
非旋波近似
相干性
quantum optics
two-level atom
thermal radiation field
degenerate two-photon
without rotating wave approximation
coherence
