title: Mode expansion and Bragg filtering for a high-fidelity fiber-based photon-pair Source.
abstract: We report the development of a fiber-based single spatial-mode source of photon-pairs where the efficiency of extracting photon-pairs is increased through the use of fiber-end expansion and Bragg filters. This improvement in efficiency enabled a spectrally bright and pure photon-pair source having a small second-order correlation function (0.03) and a raw spectral brightness of 44,700 pairs s(-1)nm(-1)mW(-1). The source can be configured to generate entangled photon-pairs, characterized via optimal and minimal quantum state tomography, to have a fidelity of 97% and tangle of 92%, without subtracting any background.
authors.affiliation: National Institute of Standards and Technology, Gaithersburg, MD 20899, USA. aling@nist.gov
authors.forename: Alexander
authors.initials: A
authors.lastname: Ling
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.forename: Jingyun
authors.initials: J
authors.lastname: Fan
authors.forename: Alan
authors.initials: A
authors.lastname: Migdall
mesh_terms: D004867:Equipment Design; D005336:Fiber Optic Technology; D055100:Optical Fibers; D055095:Optics and Photonics; D017785:Photons; D011789:Quantum Theory; D012542:Scattering, Radiation; D013696:Temperature