The Quantum Properties In A System Interacting Binomial State Light-field With Several Typical Atoms

The problem concerned with the interaction between optical field and atoms in a system has been a very important subject in the field of quantum optics. It is one of the important contents to study the dynamics and non-classical properties of the interaction between the field and the atomic system in the field of quantum optics. It is mainly discussed that the quantum properties in a system interacting binomial state light-field with several typical atoms.The main content of this thesis are as follows:(1) The theories on quantum entropy entanglement and the non-classical properties of the field are introduced, the concepts of the binomial state light-field and intrinsic decoherece are explained.(2) The quantum properties of light in the system ofΛ- type three–level atom interacting with radiation fields in binomial states are studied The influences of the initial states of theΛ-type three-level atom and the parameter of the binomial optical fields on squeezing of the optical field and the second-order coherence degree are investigated. The results indicate that the light field can show squeezing effects and continuous antibunching effect under the certain condition as it interactes with aΛ- type three–level atom .(3) The field entropy evolution of two moving atoms interacting with the binomial field in Tavis-Cummings Model is studied by means of the quantum theory. The influences of atomic motion and the parameters of the binomial optical field in different initial states are discussed emphatically. It has been shown when the field is in the middle states and the atoms is at the lower speed, the entanglement between the binomial field and the two atoms can be kept for much longer time.(4) In the consideration of Milburn model of intrinsic decoherece, the atomic population inversion in the system of the binomial optical field interacting with a two-level atom is inverstigated.The influences of instrinsic decoherece, the parametersηof the binomial optical field and photon number on the atomic population inversion are discussed. The result show that the phenomena of collapse and revival will also appear with the intrinsic decoherece. The decay process is at faster rate with the values of the parameters of the instrinsic decoherece becoming smaller.(5) The entropy envolution properties in the system of the binomial optical field interacting with a two-level atom is inverstigated by calculating Milburn equation . The influences of instrinsic decoherece, the parametersηof the binomial optical field and photon number on the entropy evolution are discussed. It is shown that the entanglement can be kept with intrinsic decoherece. The value of field entropy decreases and the entanglement is weaken for the binomial optical field changing from a coherent state to a middle state then to a fock state as the parameter of intrinsic decoherece is at a fixed value.