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Q: Fachverband Quantenoptik und Photonik

Q 43: Poster II

Q 43.69: Poster

Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof

Photon triplet generation in a photonic crystal fibre — •Andrea Cavanna, Felix Just, Bhaskar Kanseri, John Travers, Xin Jiang, Nicolas Joly, Maria V. Chekhova, Gerd Leuchs, and Philip Russell — Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, 91058 Erlangen

One of the challenging tasks in quantum optics is the creation of entangled photon triplets in Greenberger-Horne-Zeilinger (GHZ) states. Although several schemes for the production of three photon entangled states have been implemented, the photons lack the unique correlations that GHZ states offer and that make them essential in many quantum information and quantum computation protocols. We are working on the implementation of a source for GHZ states utilising the third-order nonlinearity in a microstructured photonic crystal fibre. Direct downconversion from visible light at 532nm to triplets at 1596nm will be achieved by means of intermodal phasematching. This approach allows the efficiency to be increased by many orders of magnitude due to the much smaller confinement of the fields and the increased interaction length compared to a bulk crystal source. In order to verify the optimum fibre parameters for this specific phasematching, we are observing the inverse process, namely third harmonic generation. Guided by these results, a fibre specifically custom-designed for this purpose will be fabricated.