The evolution of expanding spacetime realizes approximate quantum cloning

We investigate how quantum information, encoded in a quantum field, evolves during the expansion of spacetime. Due to information loss across the horizon, a local observer experiences this evolution as a nonunitary quantum channel. We obtain this channel in the case of de Sitter spacetime by assumin...

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Bibliographic Details
Published in:arXiv.org 2024-05
Main Authors: Niermann, Laura, Osborne, Tobias J
Format: Article
Language:English
Subjects:
Cloning
Evolution
Quantum phenomena
Online Access:Get full text
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Summary:We investigate how quantum information, encoded in a quantum field, evolves during the expansion of spacetime. Due to information loss across the horizon, a local observer experiences this evolution as a nonunitary quantum channel. We obtain this channel in the case of de Sitter spacetime by assuming the initial global state encodes a signal state via fluctuations of the Bunch-Davies vacuum. Notably, de Sitter evolution exhibits intriguing cloning properties, establishing a connection between the curvature of spacetime and the propagation of quantum information.
ISSN:2331-8422