摘要
Discerning electromagnetically induced transparency(EIT) from Autler–Townes splitting(ATS) is a significant issue in quantum optics and has attracted wide attention in various three-level configurations. Here we present a detailed study of EIT and ATS in a five-level atomic system considered to be composed of a four-level Y-type subsystem and a three-level Λ-type subsystem. In our theoretical calculations with standard density matrix formalism and steadystate approximation, we obtain the general analytical expression of the first-order matrix element responsible for the probe-field absorption. In light of the well-known three-level EIT and ATS criteria, we numerically show an intersection of EIT with ATS for the Y-type subsystem. Furthermore, we show that an EIT dip is sandwiched between two ATS dips(i.e., multi-dip mixture of EIT and ATS) in the absorption line for the five-level system, which can be explained by the dressed-state theory and Fano interference.
Discerning electromagnetically induced transparency（EIT） from Autler–Townes splitting（ATS） is a significant issue in quantum optics and has attracted wide attention in various three-level configurations. Here we present a detailed study of EIT and ATS in a five-level atomic system considered to be composed of a four-level Y-type subsystem and a three-level Λ-type subsystem. In our theoretical calculations with standard density matrix formalism and steadystate approximation, we obtain the general analytical expression of the first-order matrix element responsible for the probe-field absorption. In light of the well-known three-level EIT and ATS criteria, we numerically show an intersection of EIT with ATS for the Y-type subsystem. Furthermore, we show that an EIT dip is sandwiched between two ATS dips（i.e., multi-dip mixture of EIT and ATS） in the absorption line for the five-level system, which can be explained by the dressed-state theory and Fano interference.
作者
张晓芸
吴山
李海超
Xiao-Yun Zhang Shan Wu Hai-Chao Li(College of Physics and Electronic Science, Hubei Normal University, Huangshi 435002, China Institute for Interdisciplinary Research, Jianghan University, Wuhan 430056, China College of Science, China Three Gorges University, Yichang 443002, China)
基金
Supported by the National Natural Science Foundation of China under Grant Nos.11274132,11547208
the Science Foundation of China Three Gorges University
