Remote Control Light Field Of Quantum Statistical Properties

Quantum information science, which mainly includes quantum computer and quantum communication, has increasingly evolved as a new object. Since the famous EPR correlations were brought forward in 1935s and the concept of quantum entanglement state was given birth to, entanglement has been playing important roles in all areas of quantum information science. Entangled state has its special worth for being applied as the quantum channel, and this technique has gradually grown up and been developed in the theory of quantum communication. These years, the laser is applied quite widely in the experiments and theories as the coherent light field. And it has been a hot topic to realize the quantum communication by applying the laser field to the cavity QED technique into quantum optics.In quantum information process, the non-classical property of light field is also an important problem for research, for example the effects of anti-bunching and squeezing and so on. By using the entangle-correlation non-local property and the cavity QED technique, we can realize the target to in-direct control the quantum property of the part outside of the cavity. In this paper, we mainly investigate that control laser field's (coherent light field's) quantum statistical properties remotely. The main results of this thesis are as follow:1. By using the interaction theory between cavity and atom and considering the Jaynes-Cummings of rotation-wave approximation, take the two-mode entangled coherent light fields and an atom of two-level energy as the objects to investigate, and take one mode of the light fields to interact with the atom. The results show that as long as we measure time and the light field's parameter which effect in the cavity, we can control or change the light field's effects of anti-bunching and squeezing which has never interaction, and get all kinds of non-classical light fields. In another word, we have realized the target to control the light fields' non-classical properties by the entangled correlations between coherent light fields. 2. We still use the model above, and consider more general conditions that the atom interacts with the light field un-resonantly by many photons. In this course, we should not only consider the evolution time, but also investigate the effects on the problem from the photon's number of transition and detune. It is shown that if we modify evolved time detune and the transition-photon number, we can control or change the light field's effects of anti-bunching and squeezing more effectively which never has interaction with anything, and also make the areas wider which can be modified.