Quantum key distribution with an integrated photonic receiver
Year: 2026
Authors: Guarda., G.
Autors Affiliation: European Lab Nonlinear Spect LENS, I-50019 Sesto Fiorentino, Italy; Consiglio Nazl Ric CNR INO, Ist Nazl Ottica, I-50125 Florence, Italy.
Abstract: Photonic integrated circuits (PICs) are key to advancing quantum technologies for secure communications, offering inherent stability, low losses, and compactness compared to standard fiber-based and free-space systems. This research demonstrates the effectiveness of PICs in enhancing quantum communication by implementing a three-state BB84 protocol with a decoy-state method. We employ an integrated receiver to achieve significant technological progress. We extract a secure key over a record-breaking 45 dB channel attenuation, marking a milestone in maximum covered distance. Additionally, we observe a 220% increase in the secure key rate (SKR) compared to our prototype fiber-based receiver at 10 dB channel attenuation. These results underscore the potential of integrated photonics to push the boundaries of quantum communication.
Journal/Review: Nuovo Cimento C-Colloquia and Communications in Physics
Volume: 49 (5-6) Pages from: 173-1 to: 173-4
