Quantum Entanglement And Fideliy In The System Of The Light And Substance Interact

The research of quantization of radiation field, material interaction law and effect is the basic content of quantum optics. Based on the description of single-mode optical Dicke model field and N atoms interaction system as an example, a detailed examination of the system of quantum entanglement and fidelity of the dynamics properties in the energy approximate conditions, finding chaos in this system. Research shows that the original state regional center located in rules, the system of linear entropy is bigger; Initial state located in classical chaotic regional system when linear entropy is small; And initial state located in transition region, linear entropy performance for good transition rules. In addition, based on the of the detailed investigation structure characteristics of Dicke model in classical phase space. Using a variety of ways of thinking, namely, classic phase space of a bit corresponds to both initial coherent state of evolution in the quantum system. Then take the two primary state of quantum entanglement dynamic evolution take statistical average method, obtained better quantum phase space structure correspondence with classic phase spacen. With average entanglement get the corresponding relation of a better quantum dynamics and classic phase space.When research the fidelity of Dicke model dynamic evolution properties, we find, Original state in classical regional centers, the system fidelity of slow attenuation; Initial state in classical chaotic regional centers, the system fidelity of attenuated fast; And initial state located in transition region, fidelity of curve evolution for good transition rules. Therefore, we can use the fidelity of depicting system chaos, chaotic system information distortion is bigger. Change of various of system parameters, we fond:fidelity of curve evolution decay laws were damaged when the system is in detuning cases compared with resonance case, it against on system of quantum chaos describe. When the energy of the system is lesser fidelity of curve evolution attenuated fast, the system information distortion is bigger the cause of high energy.