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Open AccessArticle

Entanglement Structure in Expanding Universes

Department of Physics, Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
Entropy 2013, 15(5), 1847-1874;
Received: 15 April 2013 / Revised: 7 May 2013 / Accepted: 13 May 2013 / Published: 16 May 2013
(This article belongs to the Special Issue Quantum Information 2012)
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We investigate entanglement of a quantum field in de Sitter spacetime using a particle detector model. By considering the entanglement between two comoving detectors interacting with a scalar field, it is possible to detect the entanglement of the scalar field by swapping it to detectors. For the massless minimal scalar field, we find that the entanglement between the detectors cannot be detected when their physical separation exceeds the Hubble horizon scale. This behavior supports the appearance of the classical nature of quantum fluctuations generated during the inflationary era. View Full-Text
Keywords: entanglement; particle detector; inflation; measurement entanglement; particle detector; inflation; measurement

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Nambu, Y. Entanglement Structure in Expanding Universes. Entropy 2013, 15, 1847-1874.

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