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Source de photons uniques annoncés à 1550nm en optique guidée pour les communications quantiques

Abstract : Long distance quantum communication relies on efficient single photon sources, whose wavelength has to be centered on 1550nm. This thesis reports the realization of a heralded single photon source (HSPS) based on a periodically poled lithium niobate (PPLN) waveguide. The HSPS relies on photon pairs generated by spontaneous parametric down-conversion in a Periodically Poled Lithium Niobate (PPLN) optical waveguide and the idea is to use one of the photons to herald the arrival of the second one. Taking advantage of the guided structure, the photon pairs are collected by a single mode telecom fiber attached to the output of the waveguide. This demonstrates the potential of waveguide technologies for building efficient, stable, and compact sources.
The creation time of two successive photons pairs is unknown and the single photons at 1550nm are isolated from others, thanks to the gated detection. Essentially, this is a quantum equivalent of the classical “asynchronous transfer mode”. We point out two means to characterize the efficiency of this type of source. We first investigate an analysis model that allows us to infer the probability of having 0, 1 or 2 photons from the detection on a “Hanbury-Brown & Twiss” type setup, while we build an asynchronous equivalent to the “Hanbury-Brown & Twiss” setup in order to measure the second-order cross-correlation function. This work has lead to the demonstration of having a single photon at with a probability of 0.37, whereas the multi-photon emission probability is reduced by a factor of 12 compared to weak laser poissonian light sources at equal P1.
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https://tel.archives-ouvertes.fr/tel-00288268
Contributor : Olivier Alibart <>
Submitted on : Monday, June 16, 2008 - 11:03:52 AM
Last modification on : Wednesday, October 14, 2020 - 4:23:51 AM
Long-term archiving on: : Friday, May 28, 2010 - 8:11:16 PM

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  • HAL Id : tel-00288268, version 1

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Olivier Alibart. Source de photons uniques annoncés à 1550nm en optique guidée pour les communications quantiques. Physique Atomique [physics.atom-ph]. Université Nice Sophia Antipolis, 2004. Français. ⟨tel-00288268⟩

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