Quantum algorithms for shifted subset problems

  • Authors:
  • Ashley Montanaro

  • Affiliations:
  • Department of Computer Science, University of Bristol, Bristol, UK

  • Venue:
  • Quantum Information & Computation
  • Year:
  • 2009

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Abstract

We consider a recently proposed generalisation of the abelian hidden subgroup problem:the shifted subset problem. The problem is to determine a subset S of some abeliangroup, given access to quantum states of the form |S + x〉, for some unknown shift x.We give quantum algorithms to find Hamming spheres and other subsets of the booleancube {0, 1}n. The algorithms have time complexity polynomial in n and give rise toexponential separations from classical computation.