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Optique Intégrée pour les Communications Quantiques

Abstract : This work reports the realization of energy-time and time-bin entangled photon-pair sources based on a periodically poled lithium niobate (PPLN) waveguide. Degenerate twin photons around 1314 nm wavelength are created by spontaneous parametric down-conversion and coupled into standard telecom fibers.
The PPLN waveguide produces a conversion efficiency of more than 10-6, roughly 4 orders of magnitude more than that obtained employing bulk crystals. Even if using low power laser diodes, this engenders a significant probability for creating two pairs at a time which is an important advantage for some quantum communication protocols. We point out two simple means to characterize the pair creation probability per pump photon (CW) and for the case of a pulsed pump.
To investigate the quality of the entangled states, we perform photon-pair interference experiments, leading to visibilities of 97 % for the case of energy-time entanglement and of 84 % for the case of time-bin entanglement. Although the last figure must still be improved, these results demonstrate the potential of PPLN waveguide based sources for future quantum communication schemes.
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Contributor : Sébastien Tanzilli <>
Submitted on : Monday, March 21, 2005 - 5:08:13 PM
Last modification on : Monday, October 12, 2020 - 10:27:38 AM
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  • HAL Id : tel-00008814, version 1



Sébastien Tanzilli. Optique Intégrée pour les Communications Quantiques. Physique Atomique [physics.atom-ph]. Université Nice Sophia Antipolis, 2002. Français. ⟨tel-00008814⟩



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