Quantum-state Manipulation Of Atom-cavity System By Detecting Transmis-Sion Spectrum

Quantum information technology is the cross frontier of information technology and quantum mechanics. With the development of cavity QED technology, the researching in quantum information based on cavity QED technology is becoming the hotspot. Cavity quan-tum electrodynamics (QED) provides an almost ideal system for realizing quantum infor-mation process. Quantum entanglement as an energetic source is broadly used in Quantum information, it has an important significance in both basic quantum theory and potential ap-plication in quantum information technology.In this thesis, firstly, we introduced the development of quantum information technology, its significance and the two important components:quantum computing and quantum com-munication. Then we presented the quantum logical phase gate and the quantum information storage technology of quantum computing, and the quantum cryptography and quantum tele-portation technology of quantum communication. After that, we introduced the significance of quantum entanglement and how to generate entanglement in cavities. Then we focused on the cavity QED technique in quantum information technology applications, as well as the ad-vantages and disadvantages of cavity QED technology, and then introduced the cou-pled-cavity system and its important applications in quantum information. We compared the classical transmission spectrum and quantum spectrum, and introduced coupled-cavity system to produce atomic entanglement by detecting the transmission spectrum. And its correspond-ing physical interpretation. The atom-cavity system could collapse to an entangled state in heralded way. The present scheme can also be generalized to realization of multi-atom entan-glement.