Entanglement structure in expanding universes

Yasusada Nambu

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1847-1874
Number of pages28
Issue number5
Publication statusPublished - May 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Electrical and Electronic Engineering
  • General Physics and Astronomy
  • Mathematical Physics
  • Physics and Astronomy (miscellaneous)


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