Entropy evolution of the field interacting with a quasi-Λ-type four-level atom
Qingchun Zhou, Zhu Shi-Ning, (1)江苏科技大学数理系，镇江 212003;南京大学物理系，固体微结构物理国家重点实验室，南京 210093; (2)南京大学物理系，固体微结构物理国家重点实验室，南京 210093 · Acta Physica Sinica · 2005
The evolution of the field (atomic) entropy in a system of a quasi_Λ_type fourlevel atom interacting with an uncoupled two_mode coherent field is investigated. The effects of initial atomic state, the initial mean photon number and the splitting of the atomic energy levels on the entropy are discussed. The system reduces to that of a twolevel or threelevel atom interacting with a singlemode coherent field in special cases.