Compact energy–time entanglement source using cascaded nonlinear interactions
P. Lefebvre (University of Calgary)
R. Valivarthi (University of Calgary, California Institute of Technology)
Q. Zhou (University of Calgary, University of Electronic Science and Technology of China)
L. Oesterling (Battelle Memorial Institute)
D. Oblak (University of Calgary)
W. Tittel (TU Delft - QID/Tittel Lab, Kavli institute of nanoscience Delft, TU Delft - Quantum Communications Lab, University of Calgary)
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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% ± 0.4% and 90.5% ± 0.6% are achieved, respectively.