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Independent high-purity photons created in domain-engineered crystals

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posted on 2023-11-30, 17:42 authored by Francesco Graffitti, Peter Barrow, Massimiliano Proietti, Dmytro Kundys, Alessandro Fedrizzi
Advanced photonic quantum technology relies on multi-photon interference which requires bright sources of high-purity single photons. Here, we implement a novel domain-engineering technique for tailoring the nonlinearity of a parametric down-conversion crystal. We create pairs of independently-heralded telecom-wavelength photons and achieve high heralding, brightness and spectral purities without filtering.

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