Upper bounds for reversible circuits based on Young subgroups

  • Authors:
  • Nabila Abdessaied;Mathias Soeken;Michael Kirkedal Thomsen;Rolf Drechsler

  • Affiliations:
  • Institute of Computer Science, University of Bremen, Germany and Cyber-Physical Systems, DFKI GmbH, Bremen, Germany;Institute of Computer Science, University of Bremen, Germany and Cyber-Physical Systems, DFKI GmbH, Bremen, Germany;Institute of Computer Science, University of Bremen, Germany and DIKU, Department of Computer Science, University of Copenhagen, Denmark;Institute of Computer Science, University of Bremen, Germany and Cyber-Physical Systems, DFKI GmbH, Bremen, Germany

  • Venue:
  • Information Processing Letters
  • Year:
  • 2014

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Abstract

We present tighter upper bounds on the number of Toffoli gates needed in reversible circuits. Both multiple controlled Toffoli gates and mixed polarity Toffoli gates have been considered for this purpose. The calculation of the bounds is based on a synthesis approach based on Young subgroups that results in circuits using a more generalized gate library. Starting from an upper bound for this library we derive new bounds which improve the existing bound by around 77%.