https://doi.org/10.1140/epjqt/s40507-019-0075-x
Research
Field trial of a three-state quantum key distribution scheme in the Florence metropolitan area
1
CoE SPOC, DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark
2
Università degli Studi di Napoli Federico II, Napoli, Italy
3
CNR-INO, Istituto Nazionale di Ottica, Firenze, Italy
4
Micro Photon Devices S.r.l., Bolzano, Italy
5
I.N.Ri.M., Istituto Nazionale di Ricerca Metrologica, Torino, Italy
6
LENS, Università di Firenze, Firenze, Italy
* e-mail: dabac@fotonik.dtu.dk
Received:
4
April
2019
Accepted:
21
October
2019
Published online:
28
October
2019
In-field demonstrations in real-world scenarios boost the development of a rising technology towards its integration in existing infrastructures. Although quantum key distribution (QKD) devices are already adopted outside the laboratories, current field implementations still suffer from high costs and low performances, preventing this emerging technology from a large-scale deployment in telecommunication networks. Here we present a simple, practical and efficient QKD scheme with finite-key analysis, performed over a 21 dB-losses fiber link installed in the metropolitan area of Florence (Italy). Coexistence of quantum and weak classical communication is also demonstrated by transmitting an optical synchronization signal through the same fiber link.
© The Author(s), 2019
