title: Non-degenerated nonclassical photon pairs in a hot atomic ensemble.
abstract: We experimentally demonstrate the generation of non-degenerate nonclassical paired photons in a hot atomic ensemble using off-axis four-wave mixing. The time-resolved second-order correlated function between the Stokes photon and the anti-Stokes photon is given. The two-photon correlation between the photons obtained in this experiment is 1.87+/- 0.04, which leads to the violation of Cauchy-Schwarz inequality by a factor of 1.69+/- 0.14.
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, 230026, People's Republic of China.
authors.forename: Qun-Feng
authors.initials: QF
authors.lastname: Chen
authors.forename: Bao-Sen
authors.initials: BS
authors.lastname: Shi
authors.forename: Min
authors.initials: M
authors.lastname: Feng
authors.forename: Yong-Sheng
authors.initials: YS
authors.lastname: Zhang
authors.forename: Guang-Can
authors.initials: GC
authors.lastname: Guo