| Quantum information is a new cross-disciplinary science of quantum mechanical ininformation science and technology. It aims at realize information processing by using thefeature of quantum mechanics. Quantum entanglement is one of the most important physicalresources in quantum computation and quantum information. Therefore,it is a basic problemin quantum information science that how to characterize the quantum entanglementeffectively. On the other hand, it is found that a class of non-entangled quantum states whichcan provide exponential speeding up in specific quantum computing model. It is believedthat the quantum correlation other than entanglement in the system plays an important role.Therefore, it is also an important problem that how to characterize quantum correlation inquantum systems.In this paper, we analyze the dynamic property of quantum entanglement and quantumcorrelation in multipartite cavity-reservoir system.In the introduction section, we introducethe backgroud of quantum information science, and the property of the quantum entanglementand quantum correlation. In Chapter1, we introduce the basic concept, typical application,and experimental progress of quantum entanglement and quantum correlation. We also give abrief introduction of our work. In Chapter2, We analyze the maximally entangled mixedstates and several quantum channels, including how to solve the evolution equation in thecavity-reservoir system. Moreover, we compare the evolution of some maximally entangledpure states and that of the maximally entangled mixed states in the dissipative environment.We find that the entanglement of the maximally entangled mixed states suddenly disappearsin a shorter time than that of pure states. We conclude that the entanglement of the maximallyentangled mixed states is not more stable than some maximally entangled pure states. InChapter3, we discuss the dynamic evolution of quantum discord in the system composed ofthe cavitives and the N-mode reservoirs. We find that the quantum discord of the systemfollows some law. And we discuss the evolution of the quantum correlation measured by othermeasures. Finally, we make a summary and prospect for my work. |
