The Quantum Properties In The Coupled Λ-type Three-level Atoms Interacting With The Light Field

Interaction between atoms and light field has become an important research topic of quantum optics. The quantum properties interacting with the system between atoms and light field has aroused widespread concern. Entropy can be used as an important means of information measure in the interacting atoms and light field.It is not only sensitive to the quantum states can operate purity measurements, but also can be used to explain the dynamic behavior of quantum systems, but also is it an important tool about describing the atomic and the degree of entanglement in the process and it has been widely used in the field of quantum information. This paper studies two coupled atoms interacting with two-mode squeezed light field of quantum characteristics and coupled^-type atomic motion interact with single mode squeezed vacuum state, discusses the effects of light field (atomic) entropy about the coupling strength between atoms、 atomic Motion and field mold structure, including the following content:The Chapter Ⅰ to Ⅲ describes the interaction of light and matter fields in some of the basic theory and semi-classical theory of atoms interacting with the light field and the quantum theory and introduces the concepts and basic theory and quantum properties of quantum entropy, and do theoretical research to prepare for the following chapters.Chapter IV studied two coupled atoms interacting with two-mode squeezed light field about the time evolution of light field (atomic) entropy in the process, and discussed the effects of the compression parameters、atomic motion and field mode structure and parameters on the time evolution of the light field (atomic) entropy in the resonance and away from the atomic resonance in both cases the initial state. The results showed that:(1) the increase in the coupling strength between the atoms, atoms interact with atoms and enhanced association between atoms and light field and the interaction weakened, light-field drive atomic transition more difficult, the light field entropy gradually reduced; with light field detuning increases, the associated light field interacting with atoms and also reduced, making the entropy decreases, but the oscillation frequency increases.Chapter V uses quantum theory to study the movement of three-level atom with two coupled single-mode squeezed state of interacting coherent state field entropy evolution. It will be prepared to produce three-level atom entangled state. The results show that:with the associated increase in the coupling strength between the atoms, atoms interact with atoms and enhanced association between atoms and light field and the interaction weakened, light-field drive atomic transition more difficult, the light field entropy gradually reduced, which depends mainly on the size of the entropy of the coupling strength between the atoms; greater the atomic motion and field mold structure, atomic and field disentanglement more frequent, that the entropy of the oscillation frequency depends on the atomic motion and field mode structure parameters.Chapter VI is the summary and the forecast work.