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Quantum Correlations in de Sitter Space

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Department of Physics, Kobe University, Kobe 657-8501, Japan
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Department of Theoretical Physics and History of Science, University of the Basque Country, 48080 Bilbao, Spain
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IKERBASQUE, Basque Foundation for Science, Maria Diaz de Haro 3, 48013 Bilbao, Spain
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Laboratory for Quantum Gravity and Strings and Astrophysics, Cosmology and Gravity Center, Department of Mathematics and Applied Mathematics, University of Cape Town, Private Bag, Rondebosch 7701, South Africa
*
Author to whom correspondence should be addressed.
Academic Editors: Mariusz P. Dąbrowski, Manuel Krämer and Vincenzo Salzano
Universe 2017, 3(1), 2; https://doi.org/10.3390/universe3010002
Received: 5 December 2016 / Revised: 19 December 2016 / Accepted: 20 December 2016 / Published: 1 January 2017
(This article belongs to the Special Issue Varying Constants and Fundamental Cosmology)
We study quantum correlation of a massive scalar field in a maximally entangled state in de Sitter space. We prepare two observers, one in a global chart and the other in an open chart of de Sitter space. We find that the state becomes less entangled as the curvature of the open chart gets larger. In particular, for the cases of a massless and a conformally coupled scalar field, the quantum entanglement vanishes in the limit of infinite curvature. However, we find that the quantum discord never disappears, even in the limit that entanglement disappears. View Full-Text
Keywords: quantum correlation; de Sitter; quantum discord quantum correlation; de Sitter; quantum discord
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Soda, J.; Kanno, S.; Shock, J.P. Quantum Correlations in de Sitter Space. Universe 2017, 3, 2.

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