Practical approach to last-mile converged free-space and fiber QKD for secure city-scale networks. - Stathis, Aristeidis; Ntanos, Argiris; Kourelias, Panagiotis; Kyriazi, Evridiki; Toumasis, Panagiotis; Lyras, Nikolaos K.; Panagopoulos, Athanasios D.; Avramopoulos, Hercules; Giannoulis, Giannis (Scientific Reports, 2026)