Alice and Bob in an expanding spacetime

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

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
• Public URL: https://durham-repository.worktribe.com/output/1390975