非旋波近似中两能级原子相干性的保持

Maintaining coherence of a two-level atom without rotating wave approximation

采用非旋波近似 ,研究两能级原子与热辐射场单光子作用过程。当外加驱动场时 ,通过分析置于热辐射场中的两能级原子与外加驱动场相互作用时约化密度算符非对角元的时间演化 ,得到两能级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 。

The two-level atom interacitng with a thermal radiation field without rotating wave approximation is investigated.The time evolution properties of non-opposite angle element of two-level atom's reducible density rectangular array is discussed.Coherence properties of two-level atom is studied in one-photon processes when the two-level atom interacts with an external driving field in the thermal radiation field.We obtain the properties of an external driving field when two-level atom's coherence is maintained.