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)

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: Lavery, Professor Martin and Hadfield, Professor Robert and Dada, Dr Adetunmise and Clerici, Professor 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

• Pre-print

• Data DOI: 10.5525/gla.researchdata.1205

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
304896		EPSRC-IAA: Early Stage Commercialisation of a PET Imaging Agent for the Detection of Cardiovascular Disease and Cancer	Andrew Sutherland	Engineering and Physical Sciences Research Council (EPSRC)	EP/R511705/1	Chemistry
302459		Infrared time-domain quantum optics	Matteo Clerici	Engineering and Physical Sciences Research Council (EPSRC)	EP/S001573/1	ENG - Electronics & Nanoscale Engineering
305753		Quantum Communications hub Phase 2	Robert Hadfield	Engineering and Physical Sciences Research Council (EPSRC)	EP/T001011/1	ENG - Electronics & Nanoscale Engineering
305153		RAEng Chair Emerging Technologies	Daniele Faccio	Royal Academy of Engineering (RAE)	CiET1819/20	P&S - Physics & Astronomy