论文标题
奇特和多体局部系统中的量子相干性
Quantum Coherence in Ergodic and Many-Body Localized Systems
论文作者
论文摘要
量子相干性量化了量子状态在给定的基础上可以具有的叠加量。由于沿着沿着和多体局部系统的特征状态的结构存在差异，因此我们希望它们在给定的基础上的相干性也有所不同。在这里，我们在数值上计算了相互作用的哈密顿量与该疾病的函数的激发本特征中的量子相干性的不同度量。我们表明，量子相干性可以用作订单参数，以检测到良好的颈到多体裂痕相变。我们还进行量子淬灭研究，以区分热层和局部相中的相干性。然后，我们提出了一项协议，以计算基于测量的可局部连贯性，以研究热体和多体局部相。该协议允许人们以非破坏性方式在实验中研究量子相关性，与需要追踪子系统的措施相比，这总是会破坏连贯性和相关性。
Quantum coherence quantifies the amount of superposition a quantum state can have in a given basis. Since there is a difference in the structure of eigenstates of the ergodic and many-body localized systems, we expect them also to differ in terms of their coherences in a given basis. Here, we numerically calculate different measures of quantum coherence in the excited eigenstates of an interacting disordered Hamiltonian as a function of the disorder. We show that quantum coherence can be used as an order parameter to detect the well-studied ergodic to many-body-localized phase transition. We also perform quantum quench studies to distinguish the behavior of coherence in thermalized and localized phases. We then present a protocol to calculate measurement-based localizable coherence to investigate the thermal and many-body localized phases. The protocol allows one to investigate quantum correlations experimentally in a non-destructive way, in contrast to measures that require tracing out a subsystem, which always destroys coherence and correlation.
