二能级原子与双模腔场拉曼相互作用下的量子相干性

The quantum coherence of Raman process of two-level atom interacting with two-mode fields

针对二能级原子与双模腔场拉曼相互作用模型,求解了二能级原子体系密度矩阵微分方程,进而研究分析了系统的退相干特性。结果表明:二能级原子的量子相干性与其初始状态、双模腔场的频率、腔内的平均光子数等因素有关,当平均光子数远远大于1时,退相干现象特别明显。

The author work out the differential equation of the density matrix of the two level atom system in accordance with the Raman process of the two- level atom interacting the two- mode fields, then make research on its decoherence properties. The result reflects that the decoherence of the quit has something to do with its original state , the frequency of the two - mode fields and the average quantity of photon in the two - mode fields . Decoherence phenomenon is especially obvious when the average quantity of photon is more than one.