Decoy-state quantum key ditribution over long-distance optical fiber
Year: 2025
Authors: Guarda Giulia
Autors Affiliation: European Lab Nonlinear Spect LENS, I-50019 Sesto Fiorentino, Italy; Consiglio Nazl Ric CNR INO, Ist Nazl Ott, I-50125 Florence, Italy.
Abstract: Long distance quantum key distribution links are essential for the development of a widely spread fiber-based quantum network. For instance, it would allow for two remote users to communicate securely without the need for a trusted intermediate node. In this work, we focus on enhancing the receiver side of a quantum key distribution system, deploying state-of-the-art superconducting nanowire single photon detectors with ultra low dark count (< 1 Hz) and very high efficiency (> 90%), achieving a secure key distribution over a 55 dB losses channel with 0.6 bps rate. This result opens new possibilities for long distance secure communications.
Journal/Review: Nuovo Cimento C-Colloquia and Communications in Physics
Volume: 48 (4) Pages from: 171-1 to: 171-7
