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Entanglement and thermodynamics after a quantum quench in integrable systems

机译:可积系统中量子猝灭后的纠缠和热力学

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摘要

Entanglement and entropy are key concepts standing at the foundations of quantum and statistical mechanics. Recently, the study of quantum quenches revealed that these concepts are intricately intertwined. Although the unitary time evolution ensuing from a pure state maintains the system at zero entropy, local properties at long times are captured by a statistical ensemble with nonzero thermodynamic entropy, which is the entanglement accumulated during the dynamics. Therefore, understanding the entanglement evolution unveils how thermodynamics emerges in isolated systems. Alas, an exact computation of the entanglement dynamics was available so far only for noninteracting systems, whereas it was deemed unfeasible for interacting ones. Here, we show that the standard quasiparticle picture of the entanglement evolution, complemented with integrability-based knowledge of the steady state and its excitations, leads to a complete understanding of the entanglement dynamics in the space–time scaling limit. We thoroughly check our result for the paradigmatic Heisenberg chain.
机译:纠缠和熵是站在量子和统计力学基础上的关键概念。最近,对量子猝灭的研究表明,这些概念错综复杂地交织在一起。尽管从纯状态产生的单位时间演化将系统保持在零熵下,但长时间内的局部属性却被具有非零热力学熵的统计集合所捕获,这是动力学过程中累积的纠缠。因此,了解纠缠演化揭示了热力学如何在孤立的系统中出现。遗憾的是,到目前为止,仅对于非交互系统才可以提供纠缠动力学的精确计算,而对于交互系统则不可行。在这里,我们证明了纠缠演化的标准准粒子图,加上对稳态及其激发的基于可积性的知识的补充,可以使人们对时空标度极限中的纠缠动力学有完整的了解。我们彻底检查了范式海森堡链的结果。

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