We address continuous variable quantum key distribution (QKD) in non-Markovian lossy channels and show how the non-Markovian features may be exploited to enhance security and/or to detect the presence and the position of an eavesdropper along the transmission line. In particular, we suggest a coherent states QKD protocol which is secure against individual attacks for arbitrarily low values of the overall transmission line. Our scheme relies on specific non-Markovian properties, and cannot be implemented in ordinary Markovian channels characterized by uniform losses.
@article{arxiv.1011.0304,
title = {Continuous variable quantum key distribution in non-Markovian channels},
author = {Ruggero Vasile and Stefano Olivares and Matteo G A Paris and Sabrina Maniscalco},
journal= {arXiv preprint arXiv:1011.0304},
year = {2015}
}