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Quantum query complexity of constant-sized subgraph containment. (English) Zbl 1281.68113

Summary: We study the quantum query complexity of constant-sized subgraph containment. Such problems include determining whether a \(n\)-vertex graph contains a triangle, clique or star of some size. For a general subgraph \(H\) with \(k\) vertices, we show that \(H\) containment can be solved with quantum query complexity \(O(n^{2-\frac{2}{k}-g(H)})\), with \(g(H)\) a strictly positive function of \(H\). This is better than \(\widetilde O(n^{2-2/k})\) by Magniez et al. This result is obtained in the learning graph model of Belovs.

MSC:

68Q12 Quantum algorithms and complexity in the theory of computing
68Q25 Analysis of algorithms and problem complexity
05C60 Isomorphism problems in graph theory (reconstruction conjecture, etc.) and homomorphisms (subgraph embedding, etc.)

References:

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