Gaussian pump and quasi-phase-matching shaping in SPDC sources yields unfiltered photons with spectral purity upper bound 99.9272(6)% and two-photon interference visibilities up to 98.5(8)%.
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Optimised spectral purity of unfiltered photons via pump and nonlinearity shaping
Gaussian pump and quasi-phase-matching shaping in SPDC sources yields unfiltered photons with spectral purity upper bound 99.9272(6)% and two-photon interference visibilities up to 98.5(8)%.