Quantum Properties Of The System Of The Interaction Between Structured States Light Field And A ?-type Three-level Atom

When the non-classical light field interacts with atoms,the system can exhibit many non-classical characteristics.Based on the full quantum theory,this paper discusses some non-classical effects and characteristics of the number-phase state light field and the Pólya state light field interacting with the?-type three-level atom by means of numerical calculation.In the first chapter,we first introduce the number-phase state light field and Pólya state light field,and briefly describe the light field bunching and anti-bunching effect,light field compression,particle layout number inversion and quantum entanglement characteristics.In chapter 2,the effects of the atomic initial states and some parameters on the population inversion,optical field squeezing properties and photon anti-bunching effects in a system of the radiation field in Pólya state interacting with a?-type three-level atom are discussed by using the full quantum theory.The results show that when the atoms are in different fixed initial states,the changes for the light field probability parameters?the maximum photon number and the light field distribution parameters have the obvious influence on the recovery-collapse phenomenon of the population inversion in the system.As the initial state is the excited state or the coherent superposition state,the light field can exhibit the completely bunching or anti-bunching effect under some certain conditions of the above optical field parameters.The different initial conditions correspond to different changing manners for the observed physical quantities.If the initial state of the atom is in an excited state,and the relative detuning of the atom,the probability parameter of the light field and the maximum number of photons are simultaneously small,the X₁ component of the light field in the system may intermittently display the squeezing effect during the short time.In chapter 3,the effects of atomic initial state and some parameters on the optical field squeezing properties and photon anti-bunching effects in a system of the radiation field in Number-Phase state interacting with the?-type three-level atom are discussed by using the full quantum theory.The results show that the increase of the relative detuning amount r of the atom can make the two effects appear in the same time domain,and exhibit a certain periodicity.The increase of the optical field parameter?can make the periodic oscillation anti-bunching effect showing the uninterrupted light field.Selecting a certain value of r and?,the X₁component of the system light field can exhibit a compression effect in a certain time range at the beginning of time evolution.In chapter four,the effects of light field distribution parameters,atomic relative detuning,maximum photon number,light field probability parameters and atomic initial states on the quantum entanglement characteristics in a system of the radiation field in Pólya state interacting with a?-type three-level atom are discussed by using the quantum entropy theory.The results show that when the?-type three-level atom interacts with the Pólya state light field and the initial state is a two-level energy equal superposition state,the stable,periodically oscillating entangled state with the relatively small maximum entanglement degree can be obtained when the parameters are appropriate values.If the initial state is an excited state or a three-level equal weight superposition state,the stable,periodically oscillating entangled state with the maximum entanglement degree S_A=ln3?1.1 can be obtained when the parameters are appropriate values.The fifth chapter summarizes and forecasts the second,third and fourth chapters in the previous paper,and puts forward the clear direction and application prospects of the next research work.