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Conference on Lasers and Electro-Optics

Frequency Down-Conversion of Single Photons into the Telecom Band

G. A. Olivares-Rentería, Carlo Ottaviani, Giovanna Morigi, Helge Ruetz, Sebastian Zaske, Johannes Albert L’huillier, Christoph Becher

Published Jan 1, 2010• 2 citations
Publisher

Abstract

We propose a practical implementation for single-photon down conversion based on difference frequency generation by a nonlinear crystal. A theoretical model is presented, where the quantum noise sources, relevant to the process, are identified.
DOI
10.1364/qels.2010.qfb3

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We report a single-photon frequency down-conversion experiment. Using the difference frequency generation process in a periodically poled lithium niobate waveguide, we successfully observed the phase-preserved frequency down-conversion of a coherent pulse train with an average photon number per pulse of <<<111, from the 0.70.70.7 $\ensuremath{\mu}$m visible wavelength band to the 1.31.31.3 $\ensuremath{\mu}$m telecom band. We expect this technology to become an important tool for flexible photonic quantum networking, including the realization of quantum repeater systems over optical fiber using atom-photon entanglement sources for the visible wavelength bands.
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