简谐外磁场环境下J-C模型的热力学纠缠

摘要

以简谐外磁场环境下的J⁃C模型为研究对象，从系统的哈密顿矩阵出发，通过计算模拟得出热力学纠缠度解析表达式。计算结果表明，对应于不同的外磁场强度，系统热力学纠缠度呈周期性余弦变化，但随环境温度升高快速衰减；在相同环境温度下，系统热力学纠缠度关于磁场强度左右不对称变化。%In this paper, the Jaynes⁃Cummings model based on simple harmonic magnetic is studied. At first, proposes the thermal entanglement expression by calculation based on Hamiltonian. The statistics show that in different magnetic field, concur⁃rence changes periodically in the form of cosine transform, and declines quickly as the environmental temperature increase;on the other hand, under the environment of the same temperature, concurrence does not change over the magnetic field strength.