考虑一个二能级原子与单模热光场经由双光子过程耦合,采用量子约化熵研究了原子和场的约化熵变化规律,用共生纠缠度(Concurrence)研究了原子与场之间的纠缠演化.借助于数值计算方法,详细分析了在混态J-C模型中,Stark位移和平均光子数对约化熵变和纠缠的影响.结果表明在Stark位移影响下,原子和光场的约化熵变化量均减小.选择适当的原子初态,可以使得原子的约化熵和光场的约化熵发生交换.此外,考虑Stark位移时,原子与光场之间纠缠的最小值增大,原子与光场不再出现退纠缠态.
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