Large scale quantum entanglement in de Sitter spacetime
Abstract
We investigate quantum entanglement between two symmetric spatial regions in de Sitter space with the BunchDavies vacuum. As a discretized model of the scalar field for numerical simulation, we consider a harmonic chain model. Using the coarsegrained variables for the scalar field, it is shown that the multipartite entanglement on the superhorizon scale exists by checking the monogamy relation for the negativity which quantifies the entanglement between the two regions. Further, we consider the continuous limit of this model without coarsegraining and find that nonzero values of the logarithmic negativity exist even if the distance between two spatial regions is larger than the Hubble horizon scale.
 Publication:

Physical Review D
 Pub Date:
 July 2018
 DOI:
 10.1103/PhysRevD.98.025004
 arXiv:
 arXiv:1707.08414
 Bibcode:
 2018PhRvD..98b5004M
 Keywords:

 General Relativity and Quantum Cosmology;
 Quantum Physics
 EPrint:
 20 pages, 11 figures