title: Ultra stable all-fiber telecom-band entangled photon-pair source for turnkey quantum communication applications.
abstract: We demonstrate a novel alignment-free all-fiber source for generating telecom-band polarization-entangled photon pairs. Polarization entanglement is created by injecting two relatively delayed, orthogonally polarized pump pulses into a piece of dispersion-shifted fiber, where each one independently engages in four-photon scattering, and then removing any distinguishability between the correlated photon-pairs produced by each pulse at the fiber output. Our scheme uses a Michelson-interferometer configuration with Faraday mirrors to achieve practically desirable features such as ultra-stable performance and turnkey operation. Up to 91.7% two-photon-interference visibility is observed without subtracting the accidental coincidences that arise from background photons while operating the source at room temperature.
authors.forename: Chuang
authors.initials: C
authors.lastname: Liang
authors.forename: Kim Fook
authors.initials: KF
authors.lastname: Lee
authors.forename: Todd
authors.initials: T
authors.lastname: Levin
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.forename: Prem
authors.initials: P
authors.lastname: Kumar