A setup for discriminating between arbitrary two coherent states of a single light mode with the highest success rate allowed by quantum mechanics is presented. Its application to time-multiplexed quantum key distribution is discussed.
@article{arxiv.quant-ph/9901067,
title = {Optimal receiver for quantum cryptography with two coherent states},
author = {Konrad Banaszek},
journal= {arXiv preprint arXiv:quant-ph/9901067},
year = {2009}
}