论文标题
中介动力学中的相关性和能量
Correlations and energy in mediated dynamics
论文作者
论文摘要
量子系统发展为可区分状态所需的最小时间是由量子速度限制设置的，因此影响量子相关性和其他物理特性的变化。在这里，我们研究了在相同的能量限制下，最大程度地纠缠着直接或通过中介辅助系统相互作用的两个主要系统所需的时间。事实证明，直接交互是为了纠缠主要系统的最快方法，但事实证明，存在同样快的介导的动态。我们表明，只有当调解员最初与主要系统相关时，才能发生这种情况。这些相关性可以是完全古典的，并且可以在纠缠过程中保持经典。最终信息是，相关性节省能量：如果主要系统中最大的纠缠与最初相关的介体一样，则必须提供额外的能量。
The minimum time required for a quantum system to evolve to a distinguishable state is set by the quantum speed limit, and consequently influences the change of quantum correlations and other physical properties. Here we study the time required to maximally entangle two principal systems interacting either directly or via a mediating ancillary system, under the same energy constraints. The direct interactions are proved to provide the fastest way to entangle the principal systems, but it turns out that there exist mediated dynamics that are just as fast. We show that this can only happen if the mediator is initially correlated with the principal systems. These correlations can be fully classical and can remain classical during the entangling process. The final message is that correlations save energy: one has to supply extra energy if maximal entanglement across the principal systems is to be obtained as fast as with an initially correlated mediator.
