Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster 2: Intersectional Session

Q 23.20: Poster

Dienstag, 15. März 2011, 18:00–21:00, P1

Fabrication and characterisation of tailored waveguide PDC sources in RPE:PPLN for quantum communication — •Stephan Krapick, Hubertus Suche, Harald Herrmann, Raimund Ricken, Viktor Quiring, Christine Silberhorn, and Wolfgang Sohler — Universität Paderborn - Department Physik - AG "Integrierte Quantenoptik", Warburger Str. 100, D-33098 Paderborn

Parametric down conversion (PDC) is a well established process for the generation of photon pairs. Due to their high brightness, the spatial mode confinement and most importantly the flexibility in wavelength of the generated photon pairs, PDC devices can be utilized as ideal sources to address various ionic quantum memories in quantum repeaters. We present the results of the preparation and characterisation of waveguides in periodically poled z-cut Lithium Niobate (PPLN). In order to exploit the large second order nonlinearity of Lithium Niobate, Type I quasi-phasematching is employed to enable photon pair generation. In the fabrication process of the waveguides the promising approach of reversed proton exchange (RPE) is used. This provides us with low-loss and high-efficiency waveguides of symmetrical mode intensity distributions, which allow extraordinary fiber coupling. Various parameters have been tested to tailor the fluorescence of a 532 nm pump at will, yielding the addressability of Nd(3+)- and Tm(3+)-Ions to be used in quantum memories.