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Quantum Information and Measurement (QIM)

Measurement of Near-maximal Polarization Entanglement at 2.1 μ m

Adetunmise C. Dada, Jędrzej Kaniewski, Corin B. E. Gawith, Martin P. J. Lavery, Robert H. Hadfield, Daniele Faccio, Matteo Clerici

Published Jan 1, 2021• 0 citations
Publisher

Abstract

We present a device-independent certification of near-maximal polarization entanglement at 2.1μm. The 2-2.5-μm waveband offers reduced solar background, low- loss propagation in the atmosphere, and low-loss, low-dispersion transmission in hollow-core fibers and silicon waveguides.
DOI
10.1364/qim.2021.tu3a.3

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Near-maximal two-photon entanglement for quantum communications at 2.1 μ\muμm
Owing to a reduced solar background and low propagation losses in the atmosphere, the 2- to 2.5-μ\muμm 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 the capability for entanglement-based quantum key distribution (QKD) at 2.1 μ\muμm, obtaining a positive secure-key rate (0.417 bits/pair, with a quantum bit error rate of 5.43%) using near-maximally entangled photon pairs in a proof-of-principle device-independent QKD scenario.
The 2- to 2.5-$\ensuremath{\mu}$m waveband enjoys reduced solar background and low propagation losses in the atmosphere and hollow-core optical fibers. However, harnessing these advantages for optical quantum communications has proved challenging due to a lack of suitable quantum light sources and detectors. The authors demonstrate in this waveband a source of entangled photons that is suitable for generating secure keys for quantum key distribution, and provide device-independent certification of the entanglement. These results are promising for the future implementation of device-independent secure optical quantum communications in daylight.