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Compact energy–time entanglement source using cascaded nonlinear interactions

P. Lefebvre, R. Valivarthi, Q. Zhou, L. Oesterling, D. Oblak, and W. Tittel

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Abstract

Entangled photon pair sources are essential for applications such as quantum communication and metrology. Here we present a compact energy–time entangled photon pair source at telecom wavelengths realized through cascaded second harmonic generation and spontaneous parametric down conversion in a single periodically poled lithium niobate waveguide. We introduce and characterize methods to diminish the effects of Raman scattering, the principal being quasi-CW pumping. The quality of energy–time entanglement produced by the compact source is analyzed using two-photon interference and Franson interference, and visibilities as high as $93.9\% \pm 0.4\%$ and $90.5\% \pm 0.6\%$ are achieved, respectively.

© 2021 Optical Society of America

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