Henry, A.Barral, D.Zaquine, I.Boes, A.Mitchell, A.Belabas, N.Bencheikh, K.2023-06-202023-06-202023Optics Express, 2023; 31(5):7277-1-7277-131094-40871094-4087https://hdl.handle.net/2440/138748Photon-pair sources based on thin film lithium niobate on insulator technology have a great potential for integrated optical quantum information processing. We report on such a source of correlated twin-photon pairs generated by spontaneous parametric down conversion in a silicon nitride (SiN) rib loaded thin film periodically poled lithium niobate (LN) waveguide. The generated correlated photon pairs have a wavelength centred at 1560 nm compatible with present telecom infrastructure, a large bandwidth (21 THz) and a brightness of ∼2.5 × 105 pairs/s/mW/GHz. Using the Hanbury Brown and Twiss effect, we have also shown heralded single photon emission, achieving an autocorrelation g (2) H (0) ≃ 0.04.en© 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.Journal article10.1364/oe.4796582023-06-20635249Boes, A. [0000-0001-8443-3396]