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- W4286566616 abstract "We consider graphs with two cut vertices joined by a path with one or two edges, and prove that there can be no quantum perfect state transfer between these vertices, unless the graph has no other vertex. We achieve this result by applying the 1-sum lemma for the characteristic polynomial of graphs, the neutrino identities that relate entries of eigenprojectors and eigenvalues, and variational principles for eigenvalues (Cauchy interlacing theorem, Weyl inequalities and Wielandt minimax principle). We see our result as an intermediate step to broaden the understanding of how connectivity plays a key role in quantum walks, and as further evidence of the conjecture that no tree on four or more vertices admits state transfer. We conclude with some open problems." @default.
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- W4286566616 date "2022-11-01" @default.
- W4286566616 modified "2023-09-30" @default.
- W4286566616 title "Quantum walks do not like bridges" @default.
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- W4286566616 doi "https://doi.org/10.1016/j.laa.2022.07.009" @default.
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