We propose a practical decoy state method with heralded single photon source for quantum key distribution (QKD). In the protocol, 3 intensities are used and one can estimate the fraction of single-photon counts. The final key rate over transmission distance is simulated under various parameter sets. Due to the lower dark count than that of a coherent state, it is shown that a 3-intensity decoy-state QKD with a heralded source can work for a longer distance than that of a coherent state.
@article{arxiv.quant-ph/0610134,
title = {Practical decoy state method in quantum key distribution with heralded single photon source},
author = {Qin Wang and Xiang-Bin Wang and Guang-Can Guo},
journal= {arXiv preprint arXiv:quant-ph/0610134},
year = {2013}
}