Mode-dispersion phase matching single photon source based on thin-film lithium niobate

In the domain of integrated quantum photonics, burgeoning superiority lithium niobate’s second-order nonlinearity in electro-optic modulation makes thin-film niobate a leading photonic platform after silicon. To date, single-photon sources using has mainly adopted periodic polarization quasi-phase matching technology, which requires preparation complex electrodes for inversion waveguide to realize matching. This method inevitably introduces complexity, such as processing methods, enlarged regions, and compromised integration density. With development information ever-increasing degree constantly creates new demands. Consequently, streamlined, high-efficiency light source on is pressing issue. this study, we propose novel parametric down-conversion based mode dispersion phase theory. The strategy different from conventional strategies that utilize generate devices. contrast traditional techniques between pump fundamental light, our employs light’s higher-order mode. obtained by designing an asymmetric directional coupler. device’s yield can attain <inline-formula><tex-math id="M2">\begin{document}$3.8\times10^{7}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="15-20230743_M2.jpg"/><graphic xlink:href="15-20230743_M2.png"/></alternatives></inline-formula>/(s·mW), satisfying requirements optical processing. innovative solution expected replace quasi-phase-matching sources, thus further promoting study chips.