title: Generation of polarization-entangled photon pairs via concurrent spontaneous parametric downconversions in a single χ(2) nonlinear photonic crystal.
abstract: We propose a scheme for generating polarization-entangled photon pairs using a χ((2)) nonlinear photonic crystal, which is designed for enabling two concurrent quasi-phase-matched spontaneous parametric downconversion processes. Beamlike photon pairs produced from each process are collinear but noncollinear with the pump. Moreover, the source we design works in a postselection-free way and applies to both degenerate and nondegenerate cases. Combining possible waveguide technologies, our scheme may provide an integrated polarization entanglement source.
authors.affiliation: Department of Physics, Southeast University, Nanjing, China.
authors.forename: Y-X
authors.initials: YX
authors.lastname: Gong
authors.forename: P
authors.initials: P
authors.lastname: Xu
authors.forename: J
authors.initials: J
authors.lastname: Shi
authors.forename: L
authors.initials: L
authors.lastname: Chen
authors.forename: X Q
authors.initials: XQ
authors.lastname: Yu
authors.forename: P
authors.initials: P
authors.lastname: Xue
authors.forename: S N
authors.initials: SN
authors.lastname: Zhu