| Quantum information is a new subject, which is the combination of quantum mechanics and information science. Compared with classical information, quantum information has shown some distinguished advantages. If quantum computation and communication can be realized, there will be a profound revolution in information technology. Nowadays, some flourishing progress about quantum information has been obtained in both theory and experiment.Entangled state plays a most essential role in Quantum Information. What's more, quantum teleportation and remote state preparation which are based on the entangled state determine the realization of Quantum Information Web. Although all these mentioned subjects have gained breakthrough, the pressing problem that how we can prepare remote state with a more accurate and saving way calls for solvability. So for, Cavity Quantum Electrodynamics(cavity QED) is deemed to the most promising one. This dissertation mainly includes the following works:1. Based on the cavity QED techniques, we proposed a faithful scheme to prepare remote state of two-atom entangled state. Based on adiabatic passage, this scheme has an exciting merit that it is robust against the effects of atomic spontaneous emission. Without state measurement, it can save more operational process and classical resource.2. Introduce the teleportation of three particles entangled state which uses three pairs maximly entangled state. The advantage of this scheme is that it can save more classical resource.
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