双Jaynes-Cummings耦合模型几何量子失协研究

Geometric quantum discord in double Jaynes-Cummings model

基于Dakic提出的几何量子失协度量方法,研究了双Jaynes-Cummings(J-C)模型的几何量子失协。分析了初始态纯度、纠缠度、腔与原子间的耦合常数及腔内光子数等对几何量子失协随时间演化特性的影响。结果表明:通过提高纯度、初始纠缠度的值可以增大几何量子失协;非零光子数导致几何量子失协振荡衰减;通过调整腔与原子间的耦合常数可以改变振荡频率。

Based on the geometric quantum discord measurement method proposed by Dakic, the geometric quantum discord of double Jaynes-Cummings （J-C） model is investigated. Influences of the initial state purity, entanglement degree, coupling constant between atom and cavity, intracavity photon number on the evolution characteristics of geometric quantum discord with time are analyzed. Results show that geometric quantum discord can be increased by increasing the purity and initial entanglement value. The non-zero photon number leads to the decay of geometric quantum oscillate oscillate. The oscillation frequency can be changed by adjusting the coupling constant between the atom and cavity.