The 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.
@article{arxiv.quant-ph/0605106,
title = {Two-way Protocol for Quantum Cryptography with Imperfect Devices},
author = {M. Lucamarini and A. Cere' and G. Di Giuseppe and S. Mancini and D. Vitali and P. Tombesi},
journal= {arXiv preprint arXiv:quant-ph/0605106},
year = {2008}
}