Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 54: Quantum information: Photons and nonclassical light I
Q 54.6: Vortrag
Donnerstag, 21. März 2013, 15:30–15:45, E 001
An Efficient Integrated Two-Color Source for Heralded Single Photons — •Stephan Krapick, Harald Herrmann, Viktor Quiring, Benjamin Brecht, Hubertus Suche, and Christine Silberhorn — Universität Paderborn, Integrated Quantum Optics Group, Warburger Straße 100, 33098 Paderborn
We report on an integrated source for heralded single photons at telecom wavelength based on a type-I parametric down-conversion (PDC) process inside Titanium-indiffused periodically poled Lithium Niobate waveguides (Ti:PPLN). The on-chip integration of a passive directional coupler allows for excellent spectral separation of the generated signal and idler photons. Measurements of the heralded single photons prove a preparation efficiency of 60 % and coincidence-to-accidentals-ratios of up to 7400. For the low pump power regime we obtain a conditioned second order auto-correlation function of g(2)(0)=0.004 indicating almost pure photon pair generation. The high brightness of our source was concluded from the high average photon number generated per pump pulse of ⟨ npulse⟩=0.24 at power levels below 100 µW.