@inproceedings{29a24c8e6c6849d79c6371ac9e5c098e,
title = "Any AND-OR formula of size N can be evaluated in time N1/2+o(1) on a quantum computer",
abstract = "For any AND-OR formula of size N, there exists a bounded-error N 1/2+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(√N) 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.",
author = "Andris Ambainis and Childs, \{Andrew M.\} and Reichardt, \{Ben W.\} and Robert {\v S}palek and Shengyu Zhang",
year = "2007",
doi = "10.1109/FOCS.2007.4389507",
language = "English",
isbn = "0769530109",
series = "Proceedings - Annual IEEE Symposium on Foundations of Computer Science, FOCS",
publisher = "IEEE Computer Society",
pages = "363--372",
booktitle = "Proceedings of the 48th Annual IEEE Symposium on Foundations of Computer Science, FOCS 2007",
address = "United States",
note = "48th Annual IEEE Symposium on Foundations of Computer Science, FOCS 2007 ; Conference date: 20-10-2007 Through 23-10-2007",
}