The Transfer Of Quantum States

The interaction of atoms and cavity fields in the field of quantum optics has been a subject of concern, The light field squeezing has become a hot topic due to its potential applications in optical communications. Later, the concept of atomic squeezing has been put forward, there are good prospects for improving the experi-mental accuracy and quantum information. Various characteristics and mechanism of the light field squeezing and the atomic squeezing have been widely reported. This article focuses on the atomic spin squeezing,The atomic spin squeezing in real life is mainly applied to the two aspects. One is to judge the entanglement of multi-body and the other is applied to improve the experimental accuracy in the experiment. It has many features, such as spin squeezing of atoms radiate squeezed light. In other words, the atomic spin squeezing can be used in producing squeezed light. The reports of the atomic dipole squeezing suggested that the light field squeezing transfer to the atomic dipole squeezing. So here we put forward question whether squeezed light can be the source of the atomic squeezing and the possibility of squeezing transfer to the atomic spin.In order to verify the vision that the light field squeezing transferred to the atomic spin squeezing, We consider two different situations. One is single mode of squeezed field interact with the two-level atoms, another is that two-mode squeezed field or two single mold squeezed field interact with A-type three-level atoms. We get the equation of motion of the atoms and the cavity field by the the master equation of density matrix of this system, and get the diffusion coefficient by the general-ized Einstein relation, then obtain the output spectrum expression. First we take it into the expression of the fluctuations of the atomic spin squeezing to determine whether the atomic spin squeezing exists. And further analysis the characteristics of the atomic spin squeezing, the impact factor of the atomic spin squeezing. Then make comparison of the spin squeezing of three-level atoms which interacted with two squeezed fields and get the conclusion that we can achieve atomic spin squeezing, just two single mode squeezed field transfer more than two-mode squeezed field.