Entanglement Structure in Expanding Universes

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.

29 pages. arXiv admin note: text overlap with arXiv:1105.5212

References in corpus (6)

• Entangling Power of an Expanding Universe
• Entanglement in an expanding spacetime
• Cosmological quantum entanglement
• Extracting past-future vacuum correlations using circuit QED
• Entanglement of Quantum Fluctuations in the Inflationary Universe
• Cosmology and entanglement

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