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Lower bounds of a quantum search for an extreme point

Y. Ozhigov

1999
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Proceedings of the Royal Society A
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We show that Durr-Hoyer's quantum algorithm of searching for extreme point of integer function can not be sped up for functions chosen randomly. Any other algorithm acting in substantially shorter time o(√(2^n)) gives incorrect answer for the functions with the single point of maximum chosen randomly with probability converging to 1. The lower bound as Ω (√(2^n /b)) was established for the quantum search for solution of equations f(x)=1 where f is a Boolean function with b such solutions chosen at random with probability converging to 1.

doi:10.1098/rspa.1999.0397
fatcat:5in72fmcczaxnieotscfn3bcr4