We assess the security of a quantum key distribution protocol relying on the transmission of Gaussian-modulated coherent states and homodyne detection. This protocol is shown to be equivalent to a squeezed state protocol based on a CSS code construction, and is thus provably secure against any eavesdropping strategy. We also briefly show how this protocol can be generalized in order to improve the net key rate.
@article{arxiv.quant-ph/0312018,
title = {Security of Quantum Key Distribution with Coherent States and Homodyne Detection},
author = {S. Iblisdir and G. Van Assche and N. J. Cerf},
journal= {arXiv preprint arXiv:quant-ph/0312018},
year = {2009}
}