Alice and Bob in an expanding spacetime

Alexander, Helder; de Souza, Gustavo; Mansfield, Paul; Sampaio, Marcos

doi:10.1209/0295-5075/111/60001

Alice and Bob in an expanding spacetime

Alexander, Helder; de Souza, Gustavo; Mansfield, Paul; Sampaio, Marcos

Authors

Helder Alexander

Gustavo de Souza

Paul Mansfield

Marcos Sampaio

Abstract

We investigate the teleportation of a qubit between two observers Alice and Bob in an asymptotically flat Robertson-Walker expanding spacetime. We use scalar or fermionic field modes inside Alice's and Bob's ideal cavities and show the degradation of the teleportation quality, as measured by the fidelity, through a mechanism governed by spacetime expansion. This reduction is demonstrated to increase with the rapidity of the expansion and to be highly sensitive to the coupling of the field to spacetime curvature, becoming considerably stronger as it reduces from conformal to minimal. We explore a perturbative approach in the cosmological parameters to compute the Bogoliubov coefficients in order to evaluate and compare the fidelity degradation of fermionic and scalar fields.

Citation

Alexander, H., de Souza, G., Mansfield, P., & Sampaio, M. (2015). Alice and Bob in an expanding spacetime. European Physical Society Letters, 111(6), Article 60001. https://doi.org/10.1209/0295-5075/111/60001

Journal Article Type	Article
Acceptance Date	Sep 9, 2015
Online Publication Date	Sep 25, 2015
Publication Date	Sep 25, 2015
Deposit Date	Feb 22, 2016
Publicly Available Date	Sep 25, 2016
Journal	Europhysics Letters
Print ISSN	0295-5075
Electronic ISSN	1286-4854
Publisher	IOP Publishing
Peer Reviewed	Peer Reviewed
Volume	111
Issue	6
Article Number	60001
DOI	https://doi.org/10.1209/0295-5075/111/60001

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Copyright Statement
This is an author-created, un-copyedited version of an article published in EPL (Europhysics Letters). IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/10.1209/0295-5075/111/60001