Any AND-OR Formula of Size N can be Evaluated in time N^{1/2 + o(1)} on a Quantum Computer
Any AND-OR Formula of Size N can be Evaluated in time N^{1/2 + o(1)} on a Quantum Computer
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任何大小为 N 的 AND-OR 公式都可以在量子计算机上在 N^{1/2 o(1)} 时间内计算
DOI:
10.1137/080712167
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发表时间:
2010
期刊:
影响因子:
--
通讯作者:
Shengyu Zhang
中科院分区:
文献类型:
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作者:
A. Ambainis;Andrew M. Childs;B. Reichardt;R. Spalek;Shengyu Zhang
For any AND-OR formula of size N, there exists a bounded-error N1/2+o(1)-time quantum algorithm, based on a discrete-time quantum walk, that evaluates this formula on a black-box input. Balanced, or "approximately balanced," formulas can be evaluated in O(radicN) queries, which is optimal. It follows that the (2-o(1))th power of the quantum query complexity is a lower bound on the formula size, almost solving in the positive an open problem posed by Laplante, Lee and Szegedy.