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Efficient on-chip entangled photon pair generation at telecom wavelengths isan integral aspect of emerging quantum optical technologies, particularly forquantum communication and computing. However, moving to shorter wavelengthsenables the use of more accessible silicon detector technology and opens upapplications in imaging and spectroscopy. Here, we present high brightness($(1.6 \pm 0.3) \times 10^{9}$ pairs/mW/nm) visible-near-IR photon pairgeneration in a periodically poled lithium niobate nanophotonic waveguide. Thedegenerate spectrum of the photon pairs is centered at 811 nm with a bandwidthof 117 nm. The measured on-chip source efficiency of $(2.3\pm 0.5) \times10^{11}$ pairs/mW is on par with source efficiencies at telecom wavelengths andis also orders of magnitude higher than the efficiencies of other visiblesources implemented in bulk crystal or diffused waveguide-based technologies.These results represent the shortest wavelength of photon pairs generated in ananophotonic waveguide reported to date by nearly an octave.

Highly efficient visible and near-IR photon pair generation with thin-film lithium niobate