title: Silicon-on-insulator integrated source of polarization-entangled photons.
abstract: We report the experimental generation of polarization-entangled photons at telecommunication wavelengths using spontaneous four-wave mixing in silicon-on-insulator wire waveguides. The key component is a 2D coupler that transforms path entanglement into polarization entanglement at the output of the device. Using quantum state tomography we find that the produced state has fidelity 88% with a pure nonmaximally entangled state. The produced state violates the CHSH Bell inequality by S=2.37 ± 0.19.
authors.affiliation: Laboratoire Charles Fabry, Institut d’Optique, CNRS, Univ Paris Sud, 2 Avenue Augustin Fresnel, 91127 Palaiseau cedex, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Olislager
authors.forename: Jassem
authors.initials: J
authors.lastname: Safioui
authors.forename: Stéphane
authors.initials: S
authors.lastname: Clemmen
authors.forename: Kien Phan
authors.initials: KP
authors.lastname: Huy
authors.forename: Wim
authors.initials: W
authors.lastname: Bogaerts
authors.forename: Roel
authors.initials: R
authors.lastname: Baets
authors.forename: Philippe
authors.initials: P
authors.lastname: Emplit
authors.forename: Serge
authors.initials: S
authors.lastname: Massar