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- W2890168882 abstract "We give new quantum algorithms for evaluating composed functions whose inputs may be shared between bottom-level gates. Let f be a Boolean function and consider a function F obtained by applying f to conjunctions of possibly overlapping subsets of n variables. If f has quantum query complexity Q(f), we give an algorithm for evaluating F using [MATH HERE]) quantum queries. This improves on the bound of [MATH HERE]) that follows by treating each conjunction independently, and is tight for worst-case choices of f. Using completely different techniques, we prove a similar tight composition theorem for the approximate degree of f.By recursively applying our composition theorems, we obtain a nearly optimal O(n1−2−d) upper bound on the quantum query complexity and approximate degree of linear-size depth-d AC0 circuits. As a consequence, such circuits can be PAC learned in subexponential time, even in the challenging agnostic setting. Prior to our work, a subexponential-time algorithm was not known even for linear-size depth-3 AC0 circuits. We also show that any substantially faster learning algorithm will require fundamentally new techniques." @default.
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- W2890168882 date "2019-01-06" @default.
- W2890168882 modified "2023-09-24" @default.
- W2890168882 title "Quantum algorithms and approximating polynomials for composed functions with shared inputs" @default.
- W2890168882 doi "https://doi.org/10.5555/3310435.3310477" @default.
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