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Entropy 2013, 15(5), 1847-1874; doi:10.3390/e15051847
Article

Entanglement Structure in Expanding Universes

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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Abstract

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.
Keywords: entanglement; particle detector; inflation; measurement entanglement; particle detector; inflation; measurement
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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

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