鲁棒多体量子电池

中文摘要 AI 辅助

从多体量子电池中实际提取功必须是局域的。然而，在一般多体系统中，只有一小部分能量本征态（称为疤痕态）能够支持局域提取。由于本征态热化假说，其余的大部分态对此任务是无用的。在此，我们设计了一种通用的低复杂度协议，该协议将任何初始态引导至恰好一个疤痕态——代表电池的充电态——从中可以通过局域幺正操作提取宏观量的功。这是通过利用工程耗散与连续间接测量的非平凡相互作用实现的，此外，与单独使用这些过程的任何其他策略相比，该相互作用还带来了增强的稳定性和充电速度。而且，该协议直接在硬件层面工作，因为它不需要模拟或抑制子系统间的相互作用。因此，我们的构造使得在一般非可积多体系统的稳态中能够无限期地存储宏观电荷，并可通过纯局域方式从中提取可靠的功流。

英文摘要

Realistic work extraction from many-body quantum batteries must be local. However, only a small fraction of energy eigenstates of a generic many-body system, called scars, can support local extraction. The remaining bulk is useless for the task due to the eigenstate thermalization hypothesis. Here we devise a universal low-complexity protocol that steers any initial state towards exactly one scar---representing a charged state of the battery---from which a macroscopic amount of work can be extracted using local unitary operations. This is achieved by leveraging the nontrivial interplay of engineered dissipation and continuous indirect measurement that, in addition, leads to enhanced stability and charging speed compared to any other strategy using these processes independently. Moreover, the protocol works directly on the hardware level, in that it requires no simulation or suppression of interactions between subsystems. Our construction thereby enables macroscopic charge storage in steady states of generic nonintegrable many-body systems indefinitely, from which a reliable stream of work can be extracted via purely local means.

发表机构

• University of Stuttgart（斯图加特大学）
• University of Potsdam（波茨坦大学）

机构由 AI 辅助整理，请以论文原文为准。