2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/164090The security of a deterministic quantum scheme for communication, namely the LM05 [1], is studied in presence of a lossy channel under the assumption of imperfect generation and detection of single photons. It is shown that the scheme allows for a rate of distillable secure bits higher than that pertaining to BB84 [2]. We report on a first implementation of LM05 with weak pulses.10 pages, 3 figures. Uses OSID styleQuantum Physicstext