A non-local Hong-Ou-Mandel effect is realized via post-selection on separated outputs in a four-path interferometer, demonstrating two-photon interference without photons sharing a local beam splitter.
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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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The non-local Hong-Ou-Mandel effect
A non-local Hong-Ou-Mandel effect is realized via post-selection on separated outputs in a four-path interferometer, demonstrating two-photon interference without photons sharing a local beam splitter.
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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)%.