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Quantum Information Processing

, Volume 15, Issue 10, pp 3995–4011 | Cite as

Conceptual aspects of geometric quantum computation

  • Erik Sjöqvist
  • Vahid Azimi Mousolou
  • Carlo M. Canali
Article

Abstract

Geometric quantum computation is the idea that geometric phases can be used to implement quantum gates, i.e., the basic elements of the Boolean network that forms a quantum computer. Although originally thought to be limited to adiabatic evolution, controlled by slowly changing parameters, this form of quantum computation can as well be realized at high speed by using nonadiabatic schemes. Recent advances in quantum gate technology have allowed for experimental demonstrations of different types of geometric gates in adiabatic and nonadiabatic evolution. Here, we address some conceptual issues that arise in the realizations of geometric gates. We examine the appearance of dynamical phases in quantum evolution and point out that not all dynamical phases need to be compensated for in geometric quantum computation. We delineate the relation between Abelian and non-Abelian geometric gates and find an explicit physical example where the two types of gates coincide. We identify differences and similarities between adiabatic and nonadiabatic realizations of quantum computation based on non-Abelian geometric phases.

Keywords

Geometric phase Quantum computation Quantum gates 

Notes

Acknowledgments

E.S. acknowledges financial support from the Swedish Research Council (VR) through Grant No. D0413201. V.A.M. acknowledges support from the Department of Mathematics at University of Isfahan (Iran). C.M.C. is supported by the Department of Physics and Electrical Engineering at Linnaeus University (Sweden) and by the Swedish Research Council (VR) through Grant No. 621-2014-4785.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Department of Physics and AstronomyUppsala UniversityUppsalaSweden
  2. 2.Department of Mathematics, Faculty of ScienceUniversity of IsfahanIsfahanIran
  3. 3.Department of Physics and Electrical EngineeringLinnaeus UniversityKalmarSweden

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