Enhanced entanglement and squeezing of two-mode field from a double-ladder four-level atom
Wenwu Deng, Huatang Tan, Gao‐xiang Li · Journal of Physics B Atomic Molecular and Optical Physics · 2008
The entanglement and squeezing properties of a two-mode field are investigated in the system of a double-ladder four-level atom embedded in a two-mode cavity. It is found that the system can reduce to the nondegenerate parametric oscillator which is responsible for the entanglement and squeezing of a cavity field under suitable conditions. Moreover, compared to the field from the three-level cascade atomic system, the degree of entanglement in the present system can be improved significantly.