Near-maximal two-photon entanglement for optical quantum communication at 2.1 μm

Dada, A. C. , Kaniewski, J., Gawith, C., Lavery, M. , Hadfield, R. H. , Faccio, D. and Clerici, M. (2021) Near-maximal two-photon entanglement for optical quantum communication at 2.1 μm. Physical Review Applied, 16(5), L051005. (doi: 10.1103/PhysRevApplied.16.L051005)

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Abstract

Owing to a reduced solar background and low propagation losses in the atmosphere, the 2- to 2.5-μm waveband is a promising candidate for daylight quantum communication. This spectral region also offers low losses and low dispersion in hollow-core fibers and in silicon waveguides. We demonstrate for the first time near-maximally entangled photon pairs at 2.1 μm that could support device independent quantum key distribution (DIQKD) assuming sufficiently high channel efficiencies. The state corresponds to a positive secure-key rate (0.254 bits/pair, with a quantum bit error rate of 3.8%) based on measurements in a laboratory setting with minimal channel loss and transmission distance. This is promising for the future implementation of DIQKD at 2.1 μm.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Dada, Dr Adetunmise and Lavery, Professor Martin and Hadfield, Professor Robert and Clerici, Dr Matteo and Faccio, Professor Daniele
Authors: Dada, A. C., Kaniewski, J., Gawith, C., Lavery, M., Hadfield, R. H., Faccio, D., and Clerici, M.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Applied
Publisher:American Physical Society
ISSN:2331-7019
ISSN (Online):2331-7019
Published Online:30 November 2021
Copyright Holders:Copyright © 2021 American Physical Society
First Published:First published in Physical Review Applied 16(5): L051005
Publisher Policy:Reproduced in accordance with the publisher copyright policy
Related URLs:
Data DOI:10.5525/gla.researchdata.1205

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