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Nanofibres optiques pour la réalisation de sources de photons corrélés

Abderrahim Azzoune 1
1 Laboratoire Charles Fabry / Manolia
LCF - Laboratoire Charles Fabry
Abstract : Sources of correlated photon pairs are key components required for quantum telecommunications networks. Implementing these sources directly with optical fibers minimizes the insertion losses. We propose to design such a source from a tapered optical fiber.The tapered fiber has a diameter lower than 500 nm over a length of a few centimeters. The small diameter of the tapered section favors the non-linear effects, while the unstretched sections make it possible to connect this tapered fiber with the fibers of the telecommunication networks with very low losses.In this thesis, we present a design of a new source, fully fibered of correlated photons based on standard telecommunications tapered fibers (SMF28). To produce these pairs of photons we will use the parametric fluorescence due to symmetry breaking at the surface of a silica nanofiber.We have developed an optical microscopy measurement technique to measure all the profile of tapered fibers with nanometer resolution far beyond the diffraction limit.In parallel, we modeled the second-order nonlinear surface susceptibility by taking into account the vector aspect of the propagation of the optical field in a two or three-layered microfiber. In a second step, we define modal phase matchings that are necessary to obtain a strong parametric fluorescence. We size this nanofiber for a good optimization of pairs generation efficiency. The entire process of photon creation will be modeled.
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Abderrahim Azzoune. Nanofibres optiques pour la réalisation de sources de photons corrélés. Optique [physics.optics]. Université Paris Saclay (COmUE), 2019. Français. ⟨NNT : 2019SACLO009⟩. ⟨tel-02527173v3⟩

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