Correlated twin-photon generation in a silicon nitride loaded thin film PPLN waveguide

Photon-pair sources based on thin film lithium niobate on insulator technology have a great potential for integrated optical quantum information processing. We report on such a source of correlated twin-photon pairs generated by spontaneous parametric down conversion in a silicon nitride (SiN) rib loaded thin film periodically poled lithium niobate (LN) waveguide. The generated correlated photon pairs have a wavelength centred at 1560 nm compatible with present telecom infrastructure, a large bandwidth (21 THz) and a brightness of ∼2.5 × 105 pairs/s/mW/GHz. Using the Hanbury Brown and Twiss effect, we have also shown heralded single photon emission, achieving an autocorrelation g (2) H (0) ≃ 0.04.Antoine Henry, David Barral, Isabelle Zaquine, Andreas Boes, Arnan Mitchell, Nadia Belabas, and Kamel Bencheik

Analysis of Elliptically Polarized Maximally Entangled States for Bell Inequality Tests

When elliptically polarized maximally entangled states are considered, i.e., states having a non random phase factor between the two bipartite polarization components, the standard settings used for optimal violation of Bell inequalities are no longer adapted. One way to retrieve the maximal amount of violation is to compensate for this phase while keeping the standard Bell inequality analysis settings. We propose in this paper a general theoretical approach that allows determining and adjusting the phase of elliptically polarized maximally entangled states in order to optimize the violation of Bell inequalities. The formalism is also applied to several suggested experimental phase compensation schemes. In order to emphasize the simplicity and relevance of our approach, we also describe an experimental implementation using a standard Soleil-Babinet phase compensator. This device is employed to correct the phase that appears in the maximally entangled state generated from a type-II nonlinear photon-pair source after the photons are created and distributed over fiber channels.Comment: 8 page

Separation of the different contributions to FMR linewidth of microwave ferrites up to 40 GHz

International audienc

Design formulas for generalised 180° hybrid ring couplers

International audienc

Intracavity refractive index bragg gratings in absorbing and amplifying media

International audienc

Diffraction de réseaux d'indice en cavité Fabry-Pérot

International audienc

Étude expérimentale de la diffraction de Bragg intracavité

L'étude expérimentale d'un réseau de diffraction de Bragg inséré dans un résonateur Fabry-Pérot dissymétrique de finesse inférieure à 10 montre une efficacité de diffraction et une sélectivité angulaire améliorées respectivement d'un facteur 8 et d'un facteur 40. Ces résultats sont très prometteurs quant à l'application de cette technique à des dispositifs de traitement de l'information

Réseaux minces de diffraction en régime de Bragg

Le régime de diffraction d'un réseau infiniment mince inséré dans une cavité Fabry-Pérot est étudié, en particulier en fonction de la longueur de la cavité. Un régime de Bragg très efficace est possible même en utilisant des cavités micrométriques, ce qui peut être utile pour le traitement optique de l'information