Abstract
We present matching upper and lower bounds for the “weak” polynomial degree of the recursive Fourier sampling problem from quantum complexity theory. The degree bound is h + 1, where h is the order of recursion in the problem’s definition, and this bound is exponentially lower than the bound implied by the existence of a BQP algorithm for the problem. For the upper bound we exhibit a degree-h + 1 real polynomial that represents the problem on its entire domain. For the lower bound, we show that any non-zero polynomial agreeing with the problem, even on just its zero-inputs, must have degree at least h + 1. The lower bound applies to representing polynomials over any Field.
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© 2011 Springer-Verlag Berlin Heidelberg
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Johnson, B. (2011). The Polynomial Degree of Recursive Fourier Sampling. In: van Dam, W., Kendon, V.M., Severini, S. (eds) Theory of Quantum Computation, Communication, and Cryptography. TQC 2010. Lecture Notes in Computer Science, vol 6519. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18073-6_9
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DOI: https://doi.org/10.1007/978-3-642-18073-6_9
Publisher Name: Springer, Berlin, Heidelberg
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