中文摘要：

通过计算线性熵研究了两超导电荷量子比特与压缩相干态相互作用系统的纠缠动力学特性，讨论了两超导量子比特相对位相和压缩参数对线性熵的影响。结果表明：两超导量子比特初时处于最大纠缠态时，线性熵的值在复苏时间的一半时刻几乎趋近于零。随着压缩参数的增大，线性熵随时间的演化呈现更多的振荡行为，并且延长了线性熵最大值的持续时间，而线性熵的最大值基本保持不变。两超导量子比特的相对位相减小了两比特和场的纠缠。

英文摘要：

The dynamics of entanglement of two superconducting charge qubit system interacting with a squeezed coherent state were examined by means of linear entropy. The influence of the relative phase of the two qu- bitsjlevels and squeezing parameter on the time evolution of linear entropy was discussed. The results showed that the linear entropy almost tends to zero at half the revival time when the two qubits were initially in the maximally entangled state. It was also showed that a greater number of oscillations of the linear entropy were observed with the increasing of squeezing parameter and the sustainment time of the maximum entropy was increased. There was no change in the maximum value of the linear entropy. Moreover, the relative phase of the two qubits＇ levels decreased the degree of entanglement between the two qubits and the field.