title: Nonclassical 2-photon interference with separate intrinsically narrowband fibre sources.
abstract: In this paper, we demonstrate a source of photon pairs based on four-wave-mixing in photonic crystal fibres. Careful engineering of the phase matching conditions in the fibres enables us to create photon pairs at 597 nm and 860 nm in an intrinsically factorable state showing no spectral correlations. This allows for heralding one photon in a pure state and hence renders narrow band filtering obsolete. The source is narrow band, bright and achieves an overall detection efficiency of up to 21% per photon. For the first time, a Hong-Ou-Mandel interference with unfiltered photons from separate fibre sources is presented.
authors.affiliation: Centre for Communications Research, Department of Electrical and Electronic Engineering, University of Bristol, Queen's Building, University Walk, Bristol, BS8 1TR, UK. matthaeus.halder@bristol.ac.uk
authors.forename: M
authors.initials: M
authors.lastname: Halder
authors.forename: J
authors.initials: J
authors.lastname: Fulconis
authors.forename: B
authors.initials: B
authors.lastname: Cemlyn
authors.forename: A
authors.initials: A
authors.lastname: Clark
authors.forename: C
authors.initials: C
authors.lastname: Xiong
authors.forename: W J
authors.initials: WJ
authors.lastname: Wadsworth
authors.forename: J G
authors.initials: JG
authors.lastname: Rarity