title: Efficient two-step up-conversion by quantum-correlated photon pairs.
abstract: We theoretically investigate the sequential two-step upconversion of correlated photon pairs with positive and negative energy correlations, in terms of how the up-conversion efficiency depends on the incident pulse delay. A three-level atomic system having a metastable state is used to evaluate the up-conversion efficiency. It is shown that a photon pair with a positive energy correlation can drastically enhance the up-conversion efficiency compared with uncorrelated photons and correlated photons with a negative energy correlation.
authors.affiliation: PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan. oka@ppc.osaka-u.ac.jp
authors.forename: Hisaki
authors.initials: H
authors.lastname: Oka
mesh_terms: D003198:Computer Simulation; D008027:Light; D008962:Models, Theoretical; D017785:Photons; D011789:Quantum Theory; D012542:Scattering, Radiation