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An Exponential Separation Between Quantum Query Complexity and the Polynomial Degree

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arxiv 2301.09218 v2 pith:M2OEZ2YY submitted 2023-01-22 quant-ph

classification quant-ph
keywords polynomialseparationcomplexitydegreequantumqueryexponentialfunctions
verification ladder T0 review T1 audit T2 compute T3 formal
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While it is known that there is at most a polynomial separation between quantum query complexity and the polynomial degree for total functions, the precise relationship between the two is not clear for partial functions. In this paper, we demonstrate an exponential separation between exact polynomial degree and approximate quantum query complexity for a partial Boolean function. For an unbounded alphabet size, we have a constant versus polynomial separation.

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