An attractive implementation for quantum cryptography is the continuous variable variation, as it relies on standard telecommunication components. Modulating the quantum signal using a Gaussian format is attractive since it has been proven to be secure. This work investigates the effect of the roll-off of a root raised cosine pulse shaping and matched filter on the excess noise performance of a Gaussian modulated quantum key distribution system in a simulated back to back configuration. Contrary to intuition, it is found that the roll-off parameter does not significantly impact the performance of the system.
@article{arxiv.1808.04573,
title = {Effect of filter shape on excess noise performance in continuous variable quantum key distribution with Gaussian modulation},
author = {Hou-Man Chin and Nitin Jain and Darko Zibar and Tobias Gehring and Ulrik L. Andersen},
journal= {arXiv preprint arXiv:1808.04573},
year = {2018}
}