论文标题
本地主方程可能无法描述耗散性批判行为
Local master equations may fail to describe dissipative critical behavior
论文作者
论文摘要
局部量子主方程提供了一个简单的描述，即与不同储层的相互作用子系统。它们已被广泛用于研究开放量子系统中的非平衡关键现象。我们在这里通过分析由两个谐波振荡器组成的范式系统，每个范式都与热水浴接触，从而研究了这种局部方法的有效性。我们评估了不同温度差异的稳态平均职业数量，发现本地主方程通常无法再现精确的量子范围方程式描述的结果。我们将此属性与本地方案无力正确地表征间隔相关性相关联，我们借助量子相互信息来量化。
Local quantum master equations provide a simple description of interacting subsystems coupled to different reservoirs. They have been widely used to study nonequilibrium critical phenomena in open quantum systems. We here investigate the validity of such a local approach by analyzing a paradigmatic system made of two harmonic oscillators each in contact with a heat bath. We evaluate the steady-state mean occupation number for varying temperature differences and find that local master equations generally fail to reproduce the results of an exact quantum-Langevin-equation description. We relate this property to the inability of the local scheme to properly characterize intersystem correlations, which we quantify with the help of the quantum mutual information.
