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Conference on Lasers and Electro-Optics

High-visibility interference between two heralded pure-state photons without spectral filtering

Changchen Chen, Jeffrey H. Shapiro, Franco N. C. Wong

Published Jan 1, 2018• 0 citations
Publisher

Abstract

We measure 90% visibility in Hong-Ou-Mandel interference between two independent heralded single photons from pulsed spontaneous parametric downconversion with a Gaussian spectral phase-matching profile, and study its dependence on the pump spectral properties.
DOI
10.1364/cleo_qels.2018.fm3g.4

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We present an experimental demonstration of heralded single photons prepared in pure quantum states from a parametric down-conversion source. It is shown that, through controlling the modal structure of the photon pair emission, one can generate pairs in factorable states and thence eliminate the need for spectral filters in multiple-source interference schemes. Indistinguishable heralded photons were generated in two independent spectrally engineered sources and Hong-Ou-Mandel interference observed between them without spectral filters. The measured visibility of 94.4% sets a minimum bound on the mean photon purity.