The Entanglement In A System Of Moving Atom Interacting With Field

Content: A combination of quantum mechanics and information science yields a new subject: quantum information science. The storage, display and retrieve of information coundn't without quantum states and the evolution of quantum states in quantum information science. And quantum entanglement is the most important one in many kinds of quantum states, it will have extensive and important use in two main field in quantum information science—quantum communication and quantum calculationThe properties of the entanglement between squeezing vacuum state field and moving two-level atom are investigated by using the Von Neumann entropy. The influences of field-mode structure of moving two-level atom and the squeezing degree of initial squeezing vacuum state field on the entanglement of the quantum system are discussed. The results show that atomic move can result in evolution periodically of the degree of entanglement;The quantum state will be maximally entangled state for a long time when the squeezing degree are high, the increase of field-mode structure result in more disentangled state. The properties of the entanglement between coherence state field and moving two-level atom are investigated by using the Von Neumann entropy. The influences of field-mode structure of moving two-level atom and the average photon number of initial coherence state field on the entanglement of the quantum system are discussed. The results show that With the increase of the average photon number the degree of entanglement in the system will decend in some point, also result in more such point, the increase of field-mode structure result in more disentangled state.We present a measure for generating entangled state of atom-cavity field, which is prepared based on the Jaynes—Cummings of atom-cavity field interaction. Through changing the interaction time, the degree of...