Teleportation Of Unknown Atomic States

A combination of quantum mechanics and information science yields a new subject, namely, quantum information science. Nowadays some flourish progress about quantum information has been obtained in both theory and experiment, meanwhile quantum information has shown some distinguished advantages compared with classical information. Therefore, quantum information will inaugurate a new way for the development of information. Quantum communication is a very important branch of quantum information. Quantum communication mainly includes preparation of quantum state, quantum teleportation, quantum dense coding, quantum key distribution, and so on. Quantum teleportation, originally proposed by Bennett et al in 1993, is one of the most strikingly interesting fields in quantum communication. In this thesis, we focus our research on the teleportation for the unknown atomic state. The main results of this thesis are follows:1. Based on the cavity QED techniques, we proposed probabilistic teleportation of unknown atomic states using non-maximally entangled states without Bell-state measurement. The detuned interaction between atom and single-mode cavity is used. The most distinctive advantage of our scheme is that teleportation and distillation procedure can be realized simultaneously. In addition, our scheme does not involve the Bell-state measurement.2. With the assistance of a strong classical field, we proposed efficient teleportation of unknown atomic entangled states based on the detuned interaction between atom and single-mode cavity. Thus the scheme is insensitive to both the cavity decay and the thermal field. In addition, our scheme does not require the Bell-state measurement directly and the success probability can reach 1.0 in our scheme.