We report on the experimental generation of an entangled state with a spectrally pure heralded single-photon state and a weak coherent state. By choosing group-velocity matching in the nonlinear crystal, our system for producing entangled photons was 60 times brighter than that in the earlier experiment [Phys. Rev. Lett. 90, 240401 (2003)], with no need of bandpass filters. This entanglement system is useful for quantum information protocols that require indistinguishable photons from independent sources.
@article{arxiv.1303.2780,
title = {Entangled state generation with an intrinsically pure single-photon source and a weak coherent source},
author = {Rui-Bo Jin and Ryosuke Shimizu and Fumihiro Kaneda and Yasuyoshi Mitsumori and Hideo Kosaka and Keiichi Edamatsu},
journal= {arXiv preprint arXiv:1303.2780},
year = {2013}
}