提出一种基于交叉尔非线性效应的纠缠态转移方案。利用该方案可以将离散变量光场态之间的纠缠关系转移到连续变量光场态（相干态）上。通过适当设置初始相干态的振幅，该方案可以使转移后的纠缠相干态处于最大纠缠态。

A quantization scheme for an RLC circuit with a source is proposed and the fluctuations of the charge and the magnetic flux of the circtit in several quantum states are studied. The equation o motion for the density operator of the circuit is established and solved. The solutions are disussed.

We have studied squeezing of the field in the N-photon interaction of two two-Level atoms with the radiation field initially in a squeezed state.

We propose a scheme for generating entangled states of light fields. This scheme only requires the cross- Kerr nonlinear interaction between coherent light-beams, followed by a homodyne de-tection. Therefore, this scheme is within the reach of current technology. We study in detail the generation of the entangled states states between two nodes, and that among three modes. In addition to the Bell states between two modes and the W states among three modes, we find plentiful new kinds of entangled states. Finally, the scheme can be extend to generate the entangled states among more that three modes.

We define an N-order squeezing of the radiation field and study it in the M-photo interactions of a single-mode field with one atom and with two atoms. We present the general relation betwwn N and M for which squeezing of the field is possible.