Photon-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 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. The photons are correlated and exhibit a cross correlation g(2)(0) of about 8000. Using the Hanbury Brown and Twiss effect, we have also shown heralded single photon emission, achieving an autocorrelation gH(2)(0)≃0.04.
@article{arxiv.2210.00076,
title = {Correlated twin-photon generation in a silicon nitrite loaded thin film PPLN waveguide},
author = {Antoine Henry and David Barral and Isabelle Zaquine and Andreas Boes and Arnan Mitchell and Nadia Belabas and Kamel Bencheikh},
journal= {arXiv preprint arXiv:2210.00076},
year = {2022}
}