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

Abstract

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

Main text: 10 pages, 6 figures; Supplementary material: 5 pages, 3 figures. Author initials updated

References in corpus (8)

• The Quantum Internet
• Optical Quantum Computing
• Ultra-low loss integrated visible photonics using thin-film lithium niobate
• Nonlinear interactions with an ultrahigh flux of broadband entangled photons
• Noncollinear parametric fluorescence by chirped quasi-phase matching for monocycle temporal entanglement
• Generation of broadband spontaneous parametric fluorescence using multiple bulk nonlinear crystals
• High visibility two photon interference of frequency time entangled photons generated in a quasi phase matched AlGaAs waveguide
• Entangled-Photon Coincidence Fluorescence Imaging

Cited by in corpus (2)

• Experimental Upper Bounds for Resonance-Enhanced Entangled Two-Photon Absorption Cross Section of Indocyanine Green
• Investigation of nanophotonic lithium niobate waveguides for on-chip evanescent wave sensing