Effect of a modified reservoir on the nature of interference in the spontaneous emission of a driven four-level atom

The effect of a modified reservoir on the nature of the quantum interference in the spontaneous emission of a driven double V-type four-level atom has been investigated. In the model used, the double V-type transitions of a driven atom interact respectively with a free vacuum reservoir and a modified reservoir, leading to the two possible types of quantum interference. The results show that the construction or the destruction of interference in the free vacuum reservoir depends on the type of the modified reservoir and the absence or the presence of interference in the modified reservoir. More interesting, it is shown that based on the presence or the absence of interference in the modified reservoir, interference in the free vacuum reservoir can be constructive or destructive if the modified reservoir is of the type of the free vacuum reservoir. On the other hand, the interference in the free vacuum reservoir is constructive, regardless of the presence or the absence of interference in the modified reservoir, if the modified reservoir is of the type of the photonic band gap. This case, therefore, can be used to control effectively the spontaneous emission and absorption spectra