title: Production of degenerate polarization entangled photon pairs in the telecom-band from a pump enhanced parametric downconversion process.
abstract: The design and implementation of a novel source of degenerate polarization entangled photon pairs in the telecom band, based on a cavity enhanced parametric downconversion process, is presented. Two of the four maximally entangled Bell states are produced; the remaining two are obtainable by the addition of a half wave plate into the setup. The coincident photon detection rate in the A/D basis between two detectors at the output of the device revealed the production of highly entangled states, resulting in quantum interference visibilities of 0.971 ± 0.041 (ϕ = 0 state) and 0.932 ± 0.036 (ϕ = π state) respectively. The entangled states were found to break the Clauser-Horne-Shimony-Holt (CHSH) Bell inequality by around 6 standard deviations. From the measured coincidence counting rates and the optical system losses, an entangled photon pair production rate of 8.9 × 10(4) s(-1) mW(-1) pump was estimated.
authors.affiliation: National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, UK. peterjaythomas@googlemail.com
authors.forename: P J
authors.initials: PJ
authors.lastname: Thomas
authors.forename: C J
authors.initials: CJ
authors.lastname: Chunnilall
authors.forename: D J M
authors.initials: DJ
authors.lastname: Stothard
authors.forename: D A
authors.initials: DA
authors.lastname: Walsh
authors.forename: M H
authors.initials: MH
authors.lastname: Dunn
mesh_terms: D000669:Amplifiers, Electronic; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D053844:Lasers, Solid-State; D008962:Models, Theoretical; D017785:Photons; D013685:Telecommunications / Q000295:instrumentation*