Field trial of a three-state quantum key distribution scheme in the Florence metropolitan area

EPJ Quantum Technology - 2019
Davide Bacco1, Ilaria Vagniluca2, Beatrice Da Lio1, Nicola Biagi3, Adriano Della Frera4, Davide Calonico5, Costanza Toninelli3, F. S. Cataliotti3, M. Bellini3, Leif Katsuo Oxenløwe1, Alessandro Zavatta6
1CoE SPOC, DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark
2Università degli Studi di Napoli “Federico II”, Napoli, Italy
3CNR-INO, Istituto Nazionale di Ottica, Firenze, Italy
4Micro Photon Devices S.r.l., Bolzano, Italy
5I.N.Ri.M., Istituto Nazionale di Ricerca Metrologica, Torino, Italy
6LENS, Università di Firenze, Firenze, Italy

Tóm tắt

Abstract 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.

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