论文标题
多体量子系统的局部淬火光谱
Local quench spectroscopy of many-body quantum systems
论文作者
论文摘要
淬火光谱是一种相对较新的方法，可以通过监测淬火后真实空间可观察物的不平衡动力学来研究多体量子系统的光谱特性。到目前为止，该方法已设计用于全球淬火或使用动量分辨激发的本地工程。在这里，我们将淬灭光谱法扩展到局部淬火。我们表明，它使我们能够提取有关系统的全局属性的定量信息，尤其是基本激发谱。使用最先进的数值方法，我们按照各种局部淬火协议模拟各种量子系统的不平衡动力学，并演示了为任何选择的模型设计适当的局部淬火协议的一般方案。我们提供了如何在现实的当前一代实验中实现局部淬灭协议的详细示例，包括超速原子气体和被困的离子系统。
Quench spectroscopy is a relatively new method which enables the investigation of spectral properties of many-body quantum systems by monitoring the out-of-equilibrium dynamics of real-space observables after a quench. So far the approach has been devised for global quenches or using local engineering of momentum-resolved excitations. Here, we extend the quench spectroscopy method to local quenches. We show that it allows us to extract quantitative information about global properties of the system, and in particular the elementary excitation spectrum. Using state-of-the-art numerical methods, we simulate the out-of-equilibrium dynamics of a variety of quantum systems following various local quench protocols and demonstrate a general scheme for designing an appropriate local quench protocol for any chosen model. We provide detailed examples of how the local quench protocol can be realised in realistic current generation experiments, including ultracold atomic gases and trapped ion systems.
