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Grover walks on unitary Cayley graphs and integral regular graphs

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arxiv 2405.01020 v2 pith:GB2RDCYW submitted 2024-05-02 math.CO

classification math.CO
keywords graphscayleyunitaryperfectstatetransfergroverperiodicity
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abstract

The unitary Cayley graph has vertex set $\{0,1, \hdots ,n-1\}$, where two vertices $u$ and $v$ are adjacent if $\gcd(u - v, n) = 1$. In this paper, we study periodicity and perfect state transfer of Grover walks on the unitary Cayley graphs. We characterize all periodic unitary Cayley graphs. We prove that periodicity is a necessary condition for occurrence of perfect state transfer on a vertex-transitive graph. Also, we provide a necessary and sufficient condition for the occurrence of perfect state transfer on circulant graphs. Using these, we prove that only four graphs in the class of unitary Cayley graphs exhibit perfect state transfer. Also, we provide a spectral characterization of the periodicity of Grover walks on integral regular graphs.

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  1. Perfect state transfer in Grover walks on association schemes and distance-regular graphs

    math.CO 2025-06 conditional novelty 7.0 of 10

    Perfect state transfer in Grover walks on a distance-regular graph occurs exactly when the graph is antipodal with two-vertex fibres and the Chebyshev sign pattern matches the eigenvalue parity; this classifies Hammin...

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