内禀退相干条件下非线性相互作用对量子纠缠和保真度的影响

Influence of nonlinear interaction on quantum entanglement and fidelity under intrinsic decoherence

通过求解Milburn方程,研究了包含非线性相互作用的Heisenberg自旋链模型中量子纠缠和平均保真度的动力学特性,讨论了非线性相互作用和不同初始态对量子纠缠及平均保真度退相干的影响。结果表明:系统处于铁磁或反铁磁会导致量子纠缠随非线性相互作用的变化不同,相互作用处于铁磁情形比反铁磁时纠缠变化明显;不同初始态对应不同的平均保真度表现,初始态的选择会影响系统的量子通信特性。

By solving Milburn equation,the dynamical properties of quantum entanglement and average fidelity in Heisenberg spin chain model with nonlinear interaction are investigated.The effects of nonlinear interaction and different initial states on the quantum entanglement and average fidelity decoherence are discussed.Results show that the conditions for system in ferromagnetic or antiferromagnetic axe different on change of quantum entanglement versus nonlinear interaction.When the interaction is in ferromagnetic state,the entanglement change is more obvious than that of the antiferromagnetic entanglement.Different initial states correspond to different average fidelity.The choice of initial state can affect the quantum communication characteristics of the system.