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arXiv 2406.17865quant-phcond-mat.dis-nn
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无序量子集合与无限晶格动力学等价性

Equivalence of dynamics of disordered quantum ensembles and semi-infinite lattices

University College London(伦敦大学学院)

Hallmann Óskar Gestsson, Charlie Nation, Alexandra Olaya-Castro

AI总结:

研究通过映射将无序量子系统集合的动力学等价于单粒子在无限晶格中的动力学,揭示了相干丢失的几何解释,并展示了通过晶格模型获得量子比特退相干及通过平均无序实现晶格模型求解的方法。

摘要:

我们发展了一种形式化方法,将无序量子系统集合的精确动力学映射到单个粒子沿无限晶格传播的动力学上,其中参数由原始异质量子集合的无序实现概率分布决定。这种映射提供了在平均集合时相干丢失的几何解释,并允许通过单次模拟计算整个无序集合的精确动力学。此外,通过利用反向映射,可以利用无序实现的平均来获得晶格动力学。这种等价性的潜力通过双向映射的例子得到展示:通过映射到晶格模型获得量子比特退相干,以及通过对单元格无序实现的平均求解简单晶格模型。

英文摘要:

We develop a formalism for mapping the exact dynamics of an ensemble of disordered quantum systems onto the dynamics of a single particle propagating along a semi-infinite lattice, with parameters determined by the probability distribution of disorder realizations of the original heterogeneous quantum ensemble. This mapping provides a geometric interpretation on the loss of coherence when averaging over the ensemble and allows computation of the exact dynamics of the entire disordered ensemble in a single simulation. Alternatively, by exploiting the reverse map, one can obtain lattice dynamics by averaging over realisations of disorder. The potential of this equivalence is showcased with examples of the map in both directions: obtaining dephasing of a qubit via mapping to a lattice model, and solving a simple lattice model via taking an average over realizations of disorder of a unit cell.

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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