论文标题
在连续监控的紧密结合链中纠缠多重和量子相关性的异常扩散
Entangled multiplets and unusual spreading of quantum correlations in a continuously monitored tight-binding chain
论文作者
论文摘要
我们分析了范式非互动系统中纠缠的动力学，但要经常监测局部激发密度。最近，有人猜想，这种系统中量子相关性的演变是通过半古典理论来描述的，基于纠缠的一对弹性传播准粒子，并受到单位（可集成）量子系统的流体力学方法的启发。但是，在这里，我们表明，这种猜想并未完全捕获从相互策略和连续监测之间的相互作用中出现的量子相关性的复杂行为。我们揭示了与纠缠对应结构不一致的多部分量子相关性的存在，并且在准粒子图片中将需要较大的多重组。我们还观察到量子信息已被高度定位，因为它以多体系统的相邻区域之间的集体{\ IT非冗余}方式共享。我们的结果为量子随机动力学中相关性的行为提供了新的启示，并进一步表明，这些（弱）连续监测过程可能会增强它们。
We analyze the dynamics of entanglement in a paradigmatic noninteracting system subject to continuous monitoring of the local excitation densities. Recently, it was conjectured that the evolution of quantum correlations in such system is described by a semi-classical theory, based on entangled pairs of ballistically propagating quasiparticles and inspired by the hydrodynamic approach to unitary (integrable) quantum systems. Here, however, we show that this conjecture does not fully capture the complex behavior of quantum correlations emerging from the interplay between coherent dynamics and continuous monitoring. We unveil the existence of multipartite quantum correlations which are inconsistent with an entangled-pair structure and which, within a quasiparticle picture, would require the presence of larger multiplets. We also observe that quantum information is highly delocalized, as it is shared in a collective {\it nonredundant} way among adjacent regions of the many-body system. Our results shed new light onto the behavior of correlations in quantum stochastic dynamics and further show that these may be enhanced by a (weak) continuous monitoring process.
