论文标题

量子步行的方向性通过其随机步行复制品

Directivity of quantum walk via its random walk replica

论文作者

Yamagami, Tomoki, Segawa, Etsuo, Chauvet, Nicolas, Röhm, André, Horisaki, Ryoichi, Naruse, Makoto

论文摘要

与经典的随机步行(RW)相比,量子步行(QWS)具有不同的特性,最著名的是线性扩散和定位。同时,在文献中已经研究了复制量子步行的随机步行,我们称之为量子 - 步行重复随机步行(QWRW),其中QWRW的最终属性与QWS的最终属性相吻合。但是,我们认为QWRW的独特属性尚未在前者的研究中得到充分利用,以获得对QWS的更深入或新的见解。在本文中,我们通过QWRWS强调了一维离散量子步行的方向性。通过利用QWRW允许考虑各个步行者的轨迹的事实,我们首先讨论了QWRW的未来方向的确定,通过这种方向,线性扩展和本地化的效果以另一种方式表现出来。此外,QWRW的过渡概率也可以被可视化并显示出高度复杂的形状,以新颖的方式表示QW。此外,我们讨论了RWS和QW之间来源的第一个返回时间,这是通过QWRW的概念而成为可能的。我们观察到,QW的第一个返回时间统计量与RWS完全不同,这是由QWS的线性扩展和本地化属性引起的。

Quantum walks (QWs) exhibit different properties compared with classical random walks (RWs), most notably by linear spreading and localization. In the meantime, random walks that replicate quantum walks, which we refer to as quantum-walk-replicating random walks (QWRWs), have been studied in the literature where the eventual properties of QWRW coincide with those of QWs. However, we consider that the unique attributes of QWRWs have not been fully utilized in the former studies to obtain deeper or new insights into QWs. In this paper, we highlight the directivity of one-dimensional discrete quantum walks via QWRWs. By exploiting the fact that QWRW allows trajectories of individual walkers to be considered, we first discuss the determination of future directions of QWRWs, through which the effect of linear spreading and localization is manifested in another way. Furthermore, the transition probabilities of QWRWs can also be visualized and show a highly complex shape, representing QWs in a novel way. Moreover, we discuss the first return time to the origin between RWs and QWs, which is made possible via the notion of QWRWs. We observe that the first return time statistics of QWs are quite different from RWs, caused by both the linear spreading and localization properties of QWs.

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