The Study Of Quantum Entanglement Under Certain Environment

Up to now, quantum physics is a successful and accurate description of Nature. The predictions of quantum mechanics have been realized in numerous experiments. Quantum physics has been known as one of the nuclear theory of modern physics. Quantum entanglement is a phenomenon of intriguing and counterintuitive features in quantum physics. This important phenomenon has been concerned by scientist.The phenomenon of quantum entanglement has generated tremendous amount of research in recent years because of its break to achieve information processing and quantum computing.This paper studied the behavior of entanglement in theory. The main content is divided into two parts.1. We study the entanglement behavior of two two-level atoms which are respectively in each reservoir in open system.With the constant detuning, initial association will increase the oscillation of entanglement between atoms, and enlarge entanglement between atoms, and increase entanglement between the atom and reservoir. With maximum initial association, the detuning, can hold back the decay of entanglement, so the detuning can solidify entanglement.2. We study the entanglement behaviors of two two-level atoms,which respectively interact with each two-mode cavity field connecting by the optical fiber.We mainly analyze the effect of the initial entanglement and the coupling strength between atom and cavity and the coupling between optical fiber and cavity on the entanglement evolution. The result shows that when we choose the appropriate condition, we can achieve the larger two-body entanglement and three-body entanglement,and realize the biggest entanglement transfer of the atom and cavity field.