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On exact quantum query complexity

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arxiv 1111.0475 v2 pith:5TYS26FJ submitted 2011-11-02 quant-ph

classification quant-ph
keywords complexityquantumqueryfunctionsbooleanbitsexactalgorithms
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We present several families of total boolean functions which have exact quantum query complexity which is a constant multiple (between 1/2 and 2/3) of their classical query complexity, and show that optimal quantum algorithms for these functions cannot be obtained by simply computing parities of pairs of bits. We also characterise the model of nonadaptive exact quantum query complexity in terms of coding theory and completely characterise the query complexity of symmetric boolean functions in this context. These results were originally inspired by numerically solving the semidefinite programs characterising quantum query complexity for small problem sizes. We include numerical results giving the optimal success probabilities achievable by quantum algorithms computing all boolean functions on up to 4 bits, and all symmetric boolean functions on up to 6 bits.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Classical and Quantum Query Complexity of Boolean Functions under Indefinite Causal Order

    quant-ph 2025-06 conditional novelty 7.0 of 10

    Causally indefinite classical processes can compute a constructed Boolean function family with D^0.792 queries instead of D, and indefinite causal order gives an exact three-query quantum algorithm where sequential qu...

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