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Conference on Lasers and Electro-Optics

Towards high purity heralded single photon generation in thin-film lithium niobate

C. J. Xin, Jatadhari Mishra, Amirhassan Shams‐Ansari, Carsten Langrock, M. M. Fejer, Marko Lončar

Published Jan 1, 2022• 0 citations
Publisher

Abstract

We design and fabricate dispersion-engineered thin-film lithium niobate waveguides for high-purity heralded single-photon generation in the telecommunications band, characterize the phase-matching function via sum-frequency generation, and estimate the joint spectral intensity separability.
DOI
10.1364/cleo_qels.2022.ff2j.3

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A thin-film periodically poled lithium niobate waveguide was designed and fabricated which generates entangled photon pairs at telecommunications wavelengths with high coincidences-to-accidentals counts ratio CAR>67000, two-photon interference visibility V>99%, and heralded single-photon autocorrelation g_{H}^{(2)}(0)<0.025. Nondestructive in situ diagnostics were used to determine the poling quality in 3D. Megahertz rates of photon pairs were generated by less than a milliwatt of pump power, simplifying the pump requirements and dissipation compared to traditional spontaneous parametric down-conversion lithium niobate devices.