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arXiv · 2405.04965

The evolution of expanding spacetime realizes approximate quantum cloning

Laura Niermann·Tobias J. Osborne
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Abstract

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.

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Laura Niermann, Tobias J. Osborne. 2024-05-08. The evolution of expanding spacetime realizes approximate quantum cloning. https://arxiv.org/abs/2405.04965

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