Engineered optical nonlinearity for quantum light sources

Many applications in optical quantum information processing benefit from careful spectral shaping of single-photon wave-packets. In this paper we tailor the joint spectral wave-function of photons created in parametric downconversion by engineering the nonlinearity profile of a poled crystal. We des...

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Published in:Optics express 2011-01, Vol.19 (1), p.55-65
Main Authors: Brańczyk, Agata M, Fedrizzi, Alessandro, Stace, Thomas M, Ralph, Tim C, White, Andrew G
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Language:English
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description Many applications in optical quantum information processing benefit from careful spectral shaping of single-photon wave-packets. In this paper we tailor the joint spectral wave-function of photons created in parametric downconversion by engineering the nonlinearity profile of a poled crystal. We designed a crystal with an approximately Gaussian nonlinearity profile and confirmed successful wave-packet shaping by two-photon interference experiments. We numerically show how our method can be applied for attaining one of the currently most important goals of single-photon quantum optics, the creation of pure single photons without spectral correlations.
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