Y and inverted Y-type four-level schemes for optical quantum coherence systems,which may be intuitivelyconsidered to be very simple,have not been studied intensively till now.In this paper,we present the multiformity ...Y and inverted Y-type four-level schemes for optical quantum coherence systems,which may be intuitivelyconsidered to be very simple,have not been studied intensively till now.In this paper,we present the multiformity ofthese two types of schemes by considering that they can be classified into nine possible level styles as the second-ordersub-schemes using laser fields.Further we point out the complexity of their more than one hundred realistic configurationsas the third-order four-level sub-schemes that may appear in the optical quantum coherence experiments.Throughoutthis paper we review which configurations have been studied in some research aspects and which ones not,accordingto our knowledge,in order to be propitious to next steps of theoretical and experimental investigations,especially forapplications in the fields of quantum optics,quantum information science,laser spectroscopy,and so on.展开更多
In this paper we study the influence of the relative phase between .the probe and driving fields on propagation effect in an open Doppler broadening V-type three-level atomic system with spontaneously generated cohere...In this paper we study the influence of the relative phase between .the probe and driving fields on propagation effect in an open Doppler broadening V-type three-level atomic system with spontaneously generated coherence （SGC） by using the calculation resuk of the density matrix motion equations and the propagation equations of the driving and probe fields. It is shown that the relative phase （Ф） has remarkable periodical influence on the propagation effect, and the period is 2π. By selecting appropriate value of Ф, we can get larger lasing without inversion （LW1） gain and longer propagation distance in which gain exists, and hence obtain higher probe field （i.e. LWI） intensity. When Ф=π/2, the largest LWI gain and probe field intensity can be got. In addition, the atomic exit rate （γ0） and ratio （S） of the atomic injection rates also have a considerable modulation role on the phase-dependent propagation effect. In certain value range of Y0 （S）, LWI gain and probe field intensity increase with γ0 （S） increasing. In the open system, LWI gain and probe field intensity much larger than those in the corresponding closed system can be obtained.展开更多
Abstract The reduced dynamics of a V-type three-level atom in a structure reservoir is presented, which has the exact solution in certain special condition. The Markovian and non-Markovian master equations for this co...Abstract The reduced dynamics of a V-type three-level atom in a structure reservoir is presented, which has the exact solution in certain special condition. The Markovian and non-Markovian master equations for this composite system are solved and compared with the exact solution. The solving approach can be directly generalized to the solution of a V-type multilevel system dynamics interacting with a reservoir. The results further testify that these two kinds of master equations are exploited in different coupling regime, providing guidance for further application of these variants master equations to solve multilevel system dynamics without the exact solution.展开更多
基金Supported by the Research Starting Funds of Tianjin Polytechnic University under Grant Nos.20080033 and 20070010
文摘Y and inverted Y-type four-level schemes for optical quantum coherence systems,which may be intuitivelyconsidered to be very simple,have not been studied intensively till now.In this paper,we present the multiformity ofthese two types of schemes by considering that they can be classified into nine possible level styles as the second-ordersub-schemes using laser fields.Further we point out the complexity of their more than one hundred realistic configurationsas the third-order four-level sub-schemes that may appear in the optical quantum coherence experiments.Throughoutthis paper we review which configurations have been studied in some research aspects and which ones not,accordingto our knowledge,in order to be propitious to next steps of theoretical and experimental investigations,especially forapplications in the fields of quantum optics,quantum information science,laser spectroscopy,and so on.
基金supported by the National Natural Science Foundation of China(No.10875072)
文摘In this paper we study the influence of the relative phase between .the probe and driving fields on propagation effect in an open Doppler broadening V-type three-level atomic system with spontaneously generated coherence （SGC） by using the calculation resuk of the density matrix motion equations and the propagation equations of the driving and probe fields. It is shown that the relative phase （Ф） has remarkable periodical influence on the propagation effect, and the period is 2π. By selecting appropriate value of Ф, we can get larger lasing without inversion （LW1） gain and longer propagation distance in which gain exists, and hence obtain higher probe field （i.e. LWI） intensity. When Ф=π/2, the largest LWI gain and probe field intensity can be got. In addition, the atomic exit rate （γ0） and ratio （S） of the atomic injection rates also have a considerable modulation role on the phase-dependent propagation effect. In certain value range of Y0 （S）, LWI gain and probe field intensity increase with γ0 （S） increasing. In the open system, LWI gain and probe field intensity much larger than those in the corresponding closed system can be obtained.
基金Supported by the Natural Science Foundation of Hunan Province under Grant Nos. 09JJ6011 and 11JJ6007the Natural Science Foundation of Education Department of Hunan Province under Grant Nos. 07C528 and 11C1057
文摘Abstract The reduced dynamics of a V-type three-level atom in a structure reservoir is presented, which has the exact solution in certain special condition. The Markovian and non-Markovian master equations for this composite system are solved and compared with the exact solution. The solving approach can be directly generalized to the solution of a V-type multilevel system dynamics interacting with a reservoir. The results further testify that these two kinds of master equations are exploited in different coupling regime, providing guidance for further application of these variants master equations to solve multilevel system dynamics without the exact solution.
