title: Generation of non-classical correlated photon pairs via a ladder-type atomic configuration: theory and experiment.
abstract: We experimentally generate a non-classical correlated two-color photon pair at 780 and 1529.4 nm in a ladder-type configuration using a hot 85Rb atomic vapor with the production rate of ~10(7)/s. The non-classical correlation between these two photons is demonstrated by strong violation of Cauchy-Schwarz inequality by the factor R = 48 ± 12. Besides, we experimentally investigate the relations between the correlation and some important experimental parameters such as the single-photon detuning, the powers of pumps. We also make a theoretical analysis in detail and the theoretical predictions are in reasonable agreement with our experimental results.
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China.
authors.forename: Dong-Sheng
authors.initials: DS
authors.lastname: Ding
authors.forename: Zhi-Yuan
authors.initials: ZY
authors.lastname: Zhou
authors.forename: Bao-Sen
authors.initials: BS
authors.lastname: Shi
authors.forename: Xu-Bo
authors.initials: XB
authors.lastname: Zou
authors.forename: Guang-Can
authors.initials: GC
authors.lastname: Guo
mesh_terms: D004560:Electricity; D004867:Equipment Design; D055095:Optics and Photonics / Q000379:methods; D017785:Photons; D010825:Physics / Q000379:methods*; D011789:Quantum Theory; D012413:Rubidium / Q000737:chemistry
chemical_list: D012413:Rubidium