Fast quantum algorithms for computing the unit group and class group of a number field

  • Authors:
  • Sean Hallgren

  • Affiliations:
  • NEC Laboratories America, Inc., Princeton, NJ

  • Venue:
  • Proceedings of the thirty-seventh annual ACM symposium on Theory of computing
  • Year:
  • 2005

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Abstract

Computing the unit group and class group of a number field are two of the main tasks in computational algebraic number theory. Factoring integers reduces to solving Pell's equation, which is a special case of computing the unit group, but a reduction in the other direction is not known and appears more difficult. We give polynomial-time quantum algorithms for computing the unit group and class group when the number field has constant degree.