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Three-particle Bell-like inequalities under Lorentz transformations

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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.

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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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  1. Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), P.O. Box 55134-441, Maragha, Iran

    H. Moradpour, S. Maghool & S. A. Moosavi

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  1. H. Moradpour
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Moradpour, H., Maghool, S. & Moosavi, S.A. Three-particle Bell-like inequalities under Lorentz transformations. Quantum Inf Process 14, 3913–3931 (2015). https://doi.org/10.1007/s11128-015-1064-3

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