The quantum Schur and Clebsch-Gordan transforms: I. efficient qudit circuits

  • Authors:
  • Dave Bacon;Isaac L. Chuang;Aram W. Harrow

  • Affiliations:
  • Univ. of Washington, Seattle, WA;Massachusetts Institute of Technology, Cambridge, MA;Univ. of Bristol, Bristol, U.K.

  • Venue:
  • SODA '07 Proceedings of the eighteenth annual ACM-SIAM symposium on Discrete algorithms
  • Year:
  • 2007

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Abstract

We present an efficient family of quantum circuits for a fundamental primitive in quantum information theory, the Schur transform. The Schur transform on n d-dimensional quantum systems is a transform between a standard computational basis to a labelling related to the representation theory of the symmetric and unitary groups. If we desire to implement the Schur transform to an accuracy of ε-1, then our circuit construction uses a number of gates which is polynomial in n, d and log(ε-1). The key tool in our construction is a poly(d, log n, log(ε-1)) algorithm for the ud Clebsch-Gordan transform. Our efficient circuit construction renders numerous protocols in quantum information theory computationally tractable and yields a new possible approach to quantum algorithms which is distinct from the standard paradigm of the quantum Fourier transform.