Stephan Krapick, Harald Herrmann, Viktor Quiring, Benjamin Brecht, Hubertus Suche, Christine Silberhorn
We report on an integrated source for heralded single photons at telecom wavelengths based on a type-I two-color PDC process inside a Titanium-indiffused periodically poled Lithium Niobate waveguide. The on-chip integration of a passive symmetric wavelength division demultiplexer allows for spatial separation of signal and idler photons of more than 96.5 % in the respective output port. Our measurements of the heralded single photon states prove a preparation efficiency as high as 60 % and coincidences-to-accidentals ratios of up to 7400. For the low power regime we obtain a conditioned second order auto-correlation function as low as g^(2)(0)=0.0038 indicating almost pure photon pair generation. Moreover, the high brightness of our source was concluded from the large average photon number per pulse of =0.24 at power levels below 100 \mu W.
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http://arxiv.org/abs/1211.3960
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