A linearized stabilizer formalism for systems of finite dimension

  • Authors:
  • Niel De Beaudrap

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

  • Venue:
  • Quantum Information & Computation
  • Year:
  • 2013

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Abstract

The stabilizer formalism is a scheme, generalizing well-known techniques developed by Gottesman [1] in the case of qubits, to efficiently simulate a class of transformations (stabilizer circuits, which include the quantum Fourier transform and highly entangling operations) on standard basis states of d-dimensional qudits. To determine the state of a simulated system, existing treatments involve the computation of cumulative phase factors which involve quadratic dependencies. We present a simple formalism in which Pauli operators are represented using displacement operators in discrete phase space, expressing the evolution of the state via linear transformations modulo D ≤ 2d. We thus obtain a simple proof that simulating stabilizer circuits on n qudits, involving any constant number of measurement rounds, is complete for the complexity class coModdL and may be simulated by O(log(n)2)-depth circuits for any constant d ≥ 2.