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arXiv 2104.04511cond-mat.stat-mechmath-phmath.MPnlin.CGnlin.SIquant-ph
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量子元胞自动机中精确弛豫到Gibbs和非平衡定态

Exact relaxation to Gibbs and non-equilibrium steady states in the quantum cellular automaton Rule 54

Katja Klobas, Bruno Bertini

摘要:

我们利用时间通道方法研究了量子元胞自动机规则54的非平衡动力学。我们展示了一个家庭的(非平衡)产品状态,我们能够准确地描述完整的弛豫动力学。我们用它来证明,有限子系统放松到一个单参数的吉布斯状态的家庭。我们还考虑了非均匀猝灭。具体来说,我们表明,当系统的两个半准备在两个不同的可解状态,有限的子系统在有限的距离中心最终放松到非平衡稳态(NESS)广义流体力学预测。据我们所知,这是第一个确切的描述放松到一个NESS在一个相互作用的系统,因此,第一个独立的确认广义流体动力学的非均匀淬火。

英文摘要:

We study the out-of-equilibrium dynamics of the quantum cellular automaton Rule 54 using a time-channel approach. We exhibit a family of (non-equilibrium) product states for which we are able to describe exactly the full relaxation dynamics. We use this to prove that finite subsystems relax to a one-parameter family of Gibbs states. We also consider inhomogeneous quenches. Specifically, we show that when the two halves of the system are prepared in two different solvable states, finite subsystems at finite distance from the centre eventually relax to the non-equilibrium steady state (NESS) predicted by generalised hydrodynamics. To the best of our knowledge, this is the first exact description of the relaxation to a NESS in an interacting system and, therefore, the first independent confirmation of generalised hydrodynamics for an inhomogeneous quench.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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