Fast equivalence-checking for quantum circuits

  • Authors:
  • Shigeru Yamashita;Igor L. Markov

  • Affiliations:
  • Ritsumeikan University, Kusatsu, Shiga, Japan;University of Michigan, Ann Arbor, Michigan

  • Venue:
  • Quantum Information & Computation
  • Year:
  • 2010

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Abstract

We perform formal verification of quantum circuits by integrating several techniques specialized toparticular classes of circuits. Our verification methodology is based on the new notion of a reversiblemiter that allows one to leverage existing techniques for simplification of quantum circuits. For reversiblecircuits which arise as runtime bottlenecks of key quantum algorithms, we develop severalverification techniques and empirically compare them. We also combine existing quantum verificationtools with the use of SAT-solvers. Experiments with circuits for Shor's number-factoring algorithm,containing thousands of gates, show improvements in efficiency by four orders of magnitude.