Quantum Algorithms for Element Distinctness

  • Authors:
  • Harry Buhrman;Ronald de Wolf;Christoph Dürr;Mark Heiligman;Peter H"yer;Frédéric Magniez;Miklos Santha

  • Affiliations:
  • -;-;-;-;-;-;-

  • Venue:
  • CCC '01 Proceedings of the 16th Annual Conference on Computational Complexity
  • Year:
  • 2001

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Abstract

Abstract: We present several applications of quantum amplitude amplification to finding claws and collisions in ordered or unordered functions. Our algorithms generalize those of Brassard, Hyer, and Tapp, and imply an O(N^{3/4} log N) quantum upper bound for the element distinctness problem in the comparison complexity model. This contrasts with \Theta(N log N) classical complexity. We also prove a lower bound of \Omega(\sqrt N) comparisons for this problem and derive bounds for a number of related problems.