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Localization and limit laws of a three-state alternate quantum walk on a two-dimensional lattice

机译:二维晶格上三态交替量子游动的局部化和极限定律

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A two-dimensional discrete-time quantum walk (DTQW) can be realized by alternating a two-state DTQW in one spatial dimension followed by an evolution in the other dimension. This was shown to reproduce a probability distribution for a certain configuration of a four-state DTQW on a two-dimensional lattice. In this work we present a three-state alternate DTQW with a parametrized coin-flip operator and show that it can produce localization that is also observed for a certain other configuration of the four-state DTQW and nonreproducible using the two-state alternate DTQW. We will present two limit theorems for the three-state alternate DTQW. One of the limit theorems describes a long-time limit of a return probability, and the other presents a convergence in distribution for the position of the walker on a rescaled space by time. We find that the spatial entanglement generated by the three-state alternate DTQW is higher than that by the four-state DTQW. Using all our results, we outline the relevance of these walks in three-level physical systems.
机译:二维离散时间量子行走(DTQW)可以通过在一个空间维度上交替两个状态DTQW,然后在另一个维度上进行演化来实现。事实证明,这可以针对二维晶格上的四态DTQW的特定配置重现概率分布。在这项工作中,我们提出了带有参数化硬币翻转算子的三态交替DTQW,并表明它可以产生局部化,这对于四态DTQW的某些其他配置也可以观察到,并且使用二态交替DTQW不可再现。我们将介绍三态交替DTQW的两个极限定理。极限定理中的一个描述了返回概率的长期极限,另一个极限定理在时间上按比例缩放了步行者在重新缩放的空间上的位置的分布。我们发现,三态交替DTQW产生的空间纠缠度高于四态DTQW。使用我们的所有结果,我们概述了这些步行活动在三级物理系统中的相关性。

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