title: Generation of polarization-entangled photon pairs in a Bragg reflection waveguide.
abstract: We demonstrate experimentally that spontaneous parametric down-conversion in an AlxGa(1-x)As semiconductor Bragg reflection waveguide can make for paired photons highly entangled in the polarization degree of freedom at the telecommunication wavelength of 1550 nm. The pairs of photons show visibility higher than 90% in several polarization bases and violate a Clauser-Horne-Shimony-Holt Bell-like inequality by more than 3 standard deviations. This represents a significant step toward the realization of efficient and versatile self pumped sources of entangled photon pairs on-chip.
authors.affiliation: ICFO-Institut de Ci`encies Fot`oniques, Mediterranean Technology Park, Av Carl Friedrich Gauss 3, 08860 Castelldefels, Barcelona, Spain. adam.valles@icfo.es
authors.forename: A
authors.initials: A
authors.lastname: Vallés
authors.forename: M
authors.initials: M
authors.lastname: Hendrych
authors.forename: J
authors.initials: J
authors.lastname: Svozilík
authors.forename: R
authors.initials: R
authors.lastname: Machulka
authors.forename: P
authors.initials: P
authors.lastname: Abolghasem
authors.forename: D
authors.initials: D
authors.lastname: Kang
authors.forename: B J
authors.initials: BJ
authors.lastname: Bijlani
authors.forename: A S
authors.initials: AS
authors.lastname: Helmy
authors.forename: J P
authors.initials: JP
authors.lastname: Torres
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D017785:Photons; D012031:Refractometry / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*