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.
Original language | English |
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Pages (from-to) | 1380-1385 |
Number of pages | 6 |
Journal | Journal of the Optical Society of America B: Optical Physics |
Volume | 38 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2021 |