Near-maximal Polarization Entanglement for Quantum Communications at 2.1 µm
Adetunmise C. Dada, Jędrzej Kaniewski, Corin B. E. Gawith, Martin P. J. Lavery, Robert H. Hadfield, Daniele Faccio, Matteo Clerici · Frontiers in Optics + Laser Science 2021 · 2021
We demonstrate for the first time a positive secure-key rate at 2.1 µm (0.417 bits/pair, with a quantum bit error rate of 5.43%), using near-maximally entangled photons in a proof-of-principle device-independent quantum-key-distribution scenario.