强度相关耦合双Jaynes-Cummings模型中的纠缠和量子失谐

Entanglement and quantum discord in a double J-C model with intensity-dependent coupling

研究强度相关耦合双Jaynes-Cummings模型中,两运动原子初始处于最大纠缠态、光场初始处于单模热态时,强度相关耦合、热光场平均光子数以及原子运动对两原子的纠缠和量子失谐的影响.结果表明:考虑强度相关耦合时,纠缠和量子失谐均出现周期性地消失和回复现象,并且,回复以后的纠缠和量子失谐能达到初始值.腔场温度的升高会加速纠缠和量子失谐的消失.此外,原子运动的场模结构参数对该模型中的纠缠和量子失谐影响很大,其值选择合适时,两个原子能够自始至终地保持纠缠或量子失谐状态.

Considering a double J-C model with intensity-dependent coupling, we have studied the effects of the intensity-dependent coupling, the mean photon numbers and the atomic motion, on the entanglement and quantum discord between the two two-level atoms when the moving atoms are initially in a maximally entangled state and the fields are in the single-mode thermal fields. The results show that, the entanglement and quantum discord disappear and revive periodically, and can have up to their starting values after revival. A rise in cavity temperature accelerates the death of the entanglement and quantum discord. In addition, the field-mode structural parameter has a strong effect on the entanglement and quantum discord in the system. When the field-mode structural parameter takes a suitable value, the entanglement and quantum discord of the two atoms can be kept from start to finish.