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Opt Express. 2012 Jul 2;20(14):15275-85. doi: 10.1364/OE.20.015275.

Highly indistinguishable heralded single-photon sources using parametric down conversion.

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The Institute of Scientific and Industrial Research, Osaka University, Ibaraki 567-0047, Japan.


We theoretically and experimentally investigate the conditions necessary to realize highly indistinguishable single-photon sources using parametric down conversion. The visibilities of Hong-Ou-Mandel (HOM) interference between photons in different fluorescence pairs were measured and a visibility of 95.8 ± 2% was observed using a 0.7-mm-long beta barium borate crystal and 2-nm bandpass filters, after compensating for the reflectivity of the beam splitter. A theoretical model of HOM interference visibilities is proposed that considers non-uniform down conversion process inside the nonlinear crystal. It well explains the experimental results.


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