Compact energy–time entanglement source using cascaded nonlinear interactions

Journal article (2021)

Authors

Pascal Lefebvre University of Calgary
R. Valivarthi University of Calgary, California Institute of Technology
Q. Zhou University of Electronic Science and Technology of China, University of Calgary
L. Oesterling Battelle Memorial Institute
Daniel Oblak University of Calgary
W. Tittel University of Calgary, QID/Tittel Lab - QuTech Advanced Research Centre , Quantum Communications Lab - EEMCS , Kavli institute of nanoscience Delft
Research Group
QID/Tittel Lab (QuTech Advanced Research Centre) (TU Delft)
Copyright: © 2021 P. Lefebvre, R. Valivarthi, Q. Zhou, L. Oesterling, D. Oblak, W. Tittel
DOI: https://doi.org/10.1364/JOSAB.404312
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Published Date

2021

Language

English

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Faculty

QuTech Advanced Research Centre

Department

Quantum Internet Division

Research Group

QID/Tittel Lab

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% ± 0.4% and 90.5% ± 0.6% are achieved, respectively.

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