论文标题
量子自旋系统中的局部可转换性
Local Convertibility in quantum spin systems
论文作者
论文摘要
局部可转换性是指将给定状态转换为目标状态的可能性,只是通过LOCC相对于系统的给定两部分,并且仅当且仅当初始状态的所有肾脏含量都比目标状态的所有肾脏范围都小。我们将此概念应用于绝热的发展,并询问它们是否可以通过上述意义上的LOCC渲染。我们认为,缺乏差异的局部可转换性(DLC)信号是该系统量子阶段的较高计算能力,这通常也与远程纠缠,拓扑顺序或边缘状态的存在相关。值得注意的是,DLC可以通过考虑小型子系统来检测这些全局属性。此外,我们通过争论具有有限顺序参数的状态必须是最经典的状态,从而将DLC连接到自发对称性破坏。
Local Convertibility refers to the possibility of transforming a given state into a target one, just by means of LOCC with respect to a given bipartition of the system and it is possible if and only if all the Renyi-entropies of the initial state are smaller than those of the target state. We apply this concept to adiabatic evolutions and ask whether they can be rendered through LOCC in the sense above. We argue that a lack of differential local convertibility (dLC) signals a higher computational power of the system's quantum phase, which is also usually connected with the existence of long-range entanglement, topological order, or edge-states. Remarkably, dLC can detect these global properties already by considering small subsystems. Moreover, we connect dLC to spontaneous symmetry breaking by arguing that states with finite order parameters must be the most classical ones and thus be locally convertible.