A Better Lower Bound for Quantum Algorithms Searching an Ordered List

  • Authors:
  • Andris Ambainis

  • Affiliations:
  • -

  • Venue:
  • FOCS '99 Proceedings of the 40th Annual Symposium on Foundations of Computer Science
  • Year:
  • 1999

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Abstract

We show that any quantum algorithm searching an ordered list of n elements needs to examine at least log n/12-O(1) of them. Classically, log n queries are both necessary and sufficient. This shows that quantum algorithms can achieve only a constant speedup for this problem.