title: Highly bright photon-pair generation in Doppler-broadened ladder-type atomic system.
abstract: 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 5S1/2-5P3/2-5D5/2transition of87Rb. 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.
authors.forename: Yoon-Seok
authors.initials: YS
authors.lastname: Lee
authors.forename: Sang Min
authors.initials: SM
authors.lastname: Lee
authors.forename: Heonoh
authors.initials: H
authors.lastname: Kim
authors.forename: Han Seb
authors.initials: HS
authors.lastname: Moon