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arXiv quant-ph/0401091quant-ph
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某些图问题的量子查询复杂性

Quantum query complexity of some graph problems

Christoph Durr, Mark Heiligman, Peter Hoyer, Mehdi Mhalla

摘要:

在邻接矩阵模型和邻接列表阵列模型下,研究了图问题的量子算法。我们给出了几乎紧的下限和上限的有界错误量子查询复杂性的连接,强连接,最小生成树,单源最短路径。例如,我们证明了最小生成树的查询复杂度在矩阵模型中为Theta(n^{3/2}),在数组模型中为Theta(sqrt{nm}),而连通性的复杂度在矩阵模型中也为Theta(n^{3/2}),但在数组模型中为Theta(n)。上界利用搜索程序,寻找各种条件下的函数的最小值。

英文摘要:

Quantum algorithms for graph problems are considered, both in the adjacency matrix model and in an adjacency list-like array model. We give almost tight lower and upper bounds for the bounded error quantum query complexity of Connectivity, Strong Connectivity, Minimum Spanning Tree, and Single Source Shortest Paths. For example we show that the query complexity of Minimum Spanning Tree is in Theta(n^{3/2}) in the matrix model and in Theta(sqrt{nm}) in the array model, while the complexity of Connectivity is also in Theta(n^{3/2}) in the matrix model, but in Theta(n) in the array model. The upper bounds utilize search procedures for finding minima of functions under various conditions.

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