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Lecture Notes in Computer Science
The quantum query complexity of evaluating any read-once formula with n black-box input bits is Theta(sqrt(n)). However, the corresponding problem for read-many formulas (i.e., formulas in which the inputs have fanout) is not well understood. Although the optimal read-once formula evaluation algorithm can be applied to any formula, it can be suboptimal if the inputs have large fanout. We give an algorithm for evaluating any formula with n inputs, size S, and G gates using O(minn, sqrtS, n^1/2doi:10.1007/978-3-642-33090-2_30 fatcat:sj4wkylm7bb5jmdrou7wvhuf4i