Quantum t-designs: t-wise Independence in the Quantum World

  • Authors:
  • Andris Ambainis;Joseph Emerson

  • Affiliations:
  • University of Waterloo, Canada;University of Waterloo, Canada

  • Venue:
  • CCC '07 Proceedings of the Twenty-Second Annual IEEE Conference on Computational Complexity
  • Year:
  • 2007

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Abstract

A t-design for quantum states is a finite set of quantum states with the property of simulating the Haar-measure on quantum states w.r.t. any test that uses at most t copies of a state. We give efficient constructions for approximate quantum t-designs for arbitrary t. We then show that an approximate 4-design provides a derandomization of the statedistinction problem considered by Sen (quant-ph/0512085), which is relevant to solving certain instances of the hidden subgroup problem.