A new exponential separation between quantum and classical one-way communication complexity

  • Authors:
  • Ashley Montanaro

  • Affiliations:
  • Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, UK

  • Venue:
  • Quantum Information & Computation
  • Year:
  • 2011

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Abstract

We present a new example of a partial boolean function whose one-way quantum communication complexity is exponentially lower than its one-way classical communication complexity. The problem is a natural generalisation of the previously studied Subgroup Membership problem: Alice receives a bit string x, Bob receives a permutation matrix M, and their task is to determine whether Mx = x or Mx is far from x. The proof uses Fourier analysis and an inequality of Kahn, Kalai and Linial.