Work

Fibre-integrated SPDC heralded single-photon source using Zn-Indiffused PPLN ridge waveguides at telecom wavelengths

Year: 2026

Type: article

Abstract: We report a fibre-integrated heralded single-photon source based on a commercial Zn-indiffused MgO:PPLN ridge waveguide operated in Type-0 degenerate spontaneous parametric down-conversion (SPDC). The device emits a broadband spectrum spanning approximately 70 nm across the telecom C- and L-bands, with an absolute brightness of 9.1 × 10 9 ~pairs s -1 mW -1 . After accounting for optical losses, we determine an internal heralding efficiency of (58±5) %. The source demonstrates strong multi-photon suppression, exhibiting a coincidences-to-accidentals ratio exceeding 9 × 10 4 and a heralded second-order correlation of g h (2) (0)=(5.53±0.46)×10 −4 . Low multi-photon noise and broadband emission demonstrate the viability of such platforms for wavelength-multiplexed quantum networking.

Source: Optics Continuum

DOI: 10.1364/optcon.610283