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Quantum Information Processing

, Volume 14, Issue 10, pp 3913–3931 | Cite as

Three-particle Bell-like inequalities under Lorentz transformations

  • H. Moradpour
  • S. Maghool
  • S. A. Moosavi
Article

Abstract

We study the effects of Lorentz transformations on three-particle nonlocal system states (GHZ and W) of spin 1/2 particles, using the Pauli spin operator and a three-particle generalization of Bell’s inequality, introduced by Svetlichny. In our setup, the moving and laboratory frames used the (same) set of measurement directions that maximally violate Svetlichny’s inequality in the laboratory frame. We also investigate the behavior of Mermin’s and Collins’ inequalities. We find that, regardless of the particles’ type of entanglement, violation of Svetlichny’s inequality in the moving frame is decreased by increasing the boost velocity and the energy of particles in the laboratory frame. In the relativistic regime, Svetlichny’s inequality is a good criterion to investigate the nonlocality of the GHZ state. We also find that Mermin’s and Collins’ inequalities lead to reasonable predictions, in agreement with the behavior of the spin state, about nonlocality of the W state in the relativistic regime. Then, comparing our results with those in which Czachor’s relativistic spin is used instead of the Pauli operator, we find that the results obtained by considering the Pauli spin operator are in better agreement with the behavior of spin state of the system in the relativistic information theory.

Keywords

Multipartite nonlocality Lorentz transformation Spin operator 

Notes

Acknowledgments

We are grateful to the anonymous reviewers for their worthy hints and constructive comments which help us increase our understanding of the subject. This work has been supported financially by Research Institute for Astronomy and Astrophysics of Maragha (RIAAM) under research No. 1/3720-76.

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© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Research Institute for Astronomy and Astrophysics of Maragha (RIAAM)MaraghaIran

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