Darmstadt 2008 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 28: Poster Quanteninformation

Q 28.25: Poster

Dienstag, 11. März 2008, 16:30–19:00, Poster C2

Counterpropagating PDC photon source with PPLN waveguides — •Andreas Christ, Andreas Eckstein, and Christine Silberhorn — Günther-Scharowsky-Str. 1, Bau 24

We investigate the properties of a quasi-phasematched parametric downconversion process in a periodically poled LiNbO₃ waveguide. Our aim is to provide a bright source of pure single photon pairs at the telecom wavelength, i.e. 1550 nm. To quantify the amount of frequency entanglement we perform a Schmidt-decomposition of the joint spectrum.

Our focus lies on the creation of counterpropagating photon-pairs and applications in integrated quantum networks:

Firstly these counterpropagating and uncorrelated photons enable us to design a photon source without spatial and spectral filtering. Combined with the application of a waveguide instead of a bulk crystal, we propose an ultrabright source of decorrelated photon pairs.

Secondly we investigate one of the most interesting aspects of counterpropagating photon pairs: The included separation between the signal and idler beams, offering the possibility to separately access the signal and idler photons even for degenerate type-I phasematching.