Quantum discord in de Sitter space

Sugumi Kanno, Jonathan P. Shock, Jiro Soda

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


We study quantum discord between two free modes of a massive scalar field in a maximally entangled state in de Sitter space. We introduce two observers, one in a global chart and the other in an open chart of de Sitter space, and the observers determine the quantum discord created by each detecting one of the modes. This situation is analogous to the relationship between an observer in a Minkowski chart and another in one of the two Rindler charts in flat space. We find that the state becomes less entangled as the curvature of the open chart gets larger. In particular, for the cases of a massless, and a conformally coupled scalar field, the entanglement vanishes in the limit of infinite curvature. However, we find that the quantum discord never disappears even in the limit that entanglement disappears.

Original languageEnglish
Article number125014
JournalPhysical Review D
Issue number12
Publication statusPublished - Dec 20 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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