A Fibre-Integrated SPDC Heralded Single-Photon Source Using Zn-Indiffused PPLN Ridge Waveguides at Telecom Wavelengths
Researchers created a fibre-integrated single-photon source using a Zn-indiffused MgO:PPLN ridge waveguide operating via Type-0 spontaneous parametric downconversion (SPDC). The device achieves high brightness (9.1 x 10^9 pairs s⁻¹ mW⁻¹) and excellent heralding efficiency (58%), making it highly suitable for quantum networking across the C- and L-bands.