The Study On Properties Of Light Field And Teleportation Of Quantum States

Quantum optics is a subject on the coherence properties of radiation field, quantum statistical properties and quantum characters of light interacting with matter. The research has showed that there have appeared quantum effects in the interaction of light with atoms, especially in the nonlinear process. The effects peculiar to quantum field, do not exist in classical field, which reveals the quantum nature of light, then called non-classical effects. Now it has been proved by experiments, that quantum states of cavity field can exhibit three main non-classical features, i.e. photon antibunching effect, sub-Poissonian statistics distribution, and squeezed states, which not only benefit our further understanding of light nature, but also have significant applied value in the optics field. For instance in quantum states which have squeezing effect, one quadrature phase may have reduced quantum fluctuations compared with what the relative quadrature phase does in coherent states, then this make it have different applications in optical communication systems, and so on. Therefore, the study on quantum characters of cavity field is an important topic in quantum optics.In addition, quantum information as a newly emerging subject has had a rapid development in the world since 1994, in which carries of quantum information are quantum states, so that disposal of quantum information virtually is preparation and manipulation of diversified quantum states. In this paper, on one hand, we have studied characters of cavity field, including the influence of a nonlinear medium of inversion symmetry on the properties of coherent light field (such as squeezed property, distribution of light field and coherent property) after interacting with the medium, as well as the quantum properties of the fieldsin squeezed even and squeezed odd coherent states; on the other hand, we have also done some research as to preparation and manipulation of quantum states, i.e. how to generate squeezed even and squeezed odd coherent states and how to teleport an unknown schroding cat state via ?-type three-level atom with cavity field through non-resonance process ,etc.