双模压缩真空态在Tavis-Cummings模型中的原子关联

The Cross-correlation Function between Atoms in Two-Mode Squeezing Vacuum State Tavis-Cummings Model

考虑了原子的偶极相互作用。通过计算Tavis-Cummings模型下压缩真空态的原子关联,阐明了在双模压缩真空态与环境(原子)通过双光子发生相互作用过程中量子关联随时间的演化关系。通过计算机模拟出两原子处于各种初态下时原子交叉关联随时间的演化图象,分析出在压缩指数r、偶极相互作用常数ga和相位φ等改变时的变化情况,结果表明k值的改变对于原子关联具有重要意义。当两原子处于激发态和当两原子处于一Bell基时时增大k都可以提高体系的原子关联程度。

The dipole-dipole interaction of the two atoms have been considered. By considering the teraction between the two-mode squeezing vacuum state field and the environment （atoms） ,we investigate the the cross-correlation function between atoms in two-mode squeezing vacuum state Tavis-Cummings model. With the help of the computer＇ s simulation ,we get the correlation function＇ s figures of proceeding evolution by time. finally. Analyze the changes of the function when we fix the squeezing index r and change the dipole-dipole interaction constant gα the phase φ and the inicial state whitch is determined by θ. The result of our discussion indicates that k is important to the cross-correlation of the system. When the two atoms are initially in the excited state, increase k can increase the correlation and its frequency. Analogically, when the two atoms are initially in one of the Bellstates, increase k can increase the correlation.