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arXiv 2104.08424math.COquant-ph
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由混合路和混合圈定义的量子游动的周期性

Periodicity of quantum walks defined by mixed paths and mixed cycles

Sho Kubota, Hiroto Sekido, Harunobu Yata

摘要:

本文确定了由混合路和混合圈定义的量子游动的周期性。利用量子游动的谱映射定理,将周期性的考虑归结为对$η$ -Hermite邻接矩阵的特征值分析。首先,我们研究了$η$ -Hermitian邻接矩阵的特征多项式的系数。证明了混合树的特征多项式与其基础图的特征多项式相同。我们还定义了混合循环的$n+1$类型,并证明了每一个混合循环都等价于其中之一。我们用这些结果来讨论周期性。我们证明了对于任何$η$,混合路径都是周期的。此外,我们还提供了一个混合循环是周期的充要条件,并确定了它们的周期。

英文摘要:

In this paper, we determine periodicity of quantum walks defined by mixed paths and mixed cycles. By the spectral mapping theorem of quantum walks, consideration of periodicity is reduced to eigenvalue analysis of $η$-Hermitian adjacency matrices. First, we investigate coefficients of the characteristic polynomials of $η$-Hermitian adjacency matrices. We show that the characteristic polynomials of mixed trees and their underlying graphs are same. We also define $n+1$ types of mixed cycles and show that every mixed cycle is switching equivalent to one of them. We use these results to discuss periodicity. We show that the mixed paths are periodic for any $η$. In addition, we provide a necessary and sufficient condition for a mixed cycle to be periodic and determine their periods.

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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