Frankfurt 2006 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 71: Poster Nichtlineare optische Effekte und Lichtquellen

Q 71.3: Poster

Donnerstag, 16. März 2006, 16:30–18:30, Labsaal

Generation of Correlated Photons in Photonic Crystal Fibres — •Markus Gregor, Martin Ostermeyer, and Ralf Menzel — Am Neuen Palais 10, 14469 Potsdam

The generation of entangled photons as a resource for experiments in the fields of quantum communication, quantum imaging and related areas are of vital importance. A well studied method for the generation is the spontaneous parametric down conversion based on a χ ⁽²⁾ interaction in a birefringent crystal. However there are inherent disadvantages like the low brightness and high bandwidth of the photon pairs. This can be overcome by using a χ ⁽³⁾ process in photonic crystal fibre. Due to its single mode characteristics the emerging photons are spatially well defined. By introducing a microstructure into the fibre it is possible to engineer specific dispersion relation that determines the phase matching condition. In consequence it is possible to tune the wavelength of the generated photon pairs. The bandwidth of the photons is mainly determined by the bandwidth of the pump laser and can therefore be more narrow than in the case of the spontaneous parametric down conversion. We investigate the feasibility of an experimental realisation of a source of correlated photon pairs by the means of degenerate four-wave mixing in microstructured fibres.