We report a bright photon-pair source with a coincidence counting rate per input power (cps/mW) of tens of thousands, obtained via spontaneous four-wave mixing from a Doppler-broadened atomic ensemble of the 5S1/2-5P3/2-5D5/2 transition of 87Rb. The photon-pair generation rate is enhanced by the two-photon coherence contributions from almost all the atomic velocity groups in the Doppler-broadened ladder-type atomic system. We obtained the violation of the Cauchy-Schwarz inequality by a factor of 2370(150). We believe that our scheme for highly bright paired photons is important as a useful quantum light source for quantum entanglement swapping between completely autonomous sources.
@article{arxiv.1609.02378,
title = {Highly bright photon-pair generation in Doppler-broadened ladder-type atomic system},
author = {Yoon-Seok Lee and Sang Min Lee and Heonoh Kim and Han Seb Moon},
journal= {arXiv preprint arXiv:1609.02378},
year = {2016}
}