Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 8: Quantum Optics II
Q 8.6: Vortrag
Montag, 23. März 2015, 15:45–16:00, C/HSO
A heralded single photon source for telecom wavelengths based on a PPLN waveguide — •Matthias Bock, Andreas Lenhard, and Christoph Becher — Universität des Saarlandes, FR 7.2 Experimentalphysik, Campus E2.6, 66123 Saarbrücken
Photon pair sources are a relevant part of quantum networks and quantum repeaters with photons serving as flying qubits. Especially for long distance communication between remote quantum nodes, it is reasonable to guide the photons with optical fibers. For such an application light sources generating correlated photon pairs at telecom wavelengths are required.
We present the characterization of such a pair source based on spontaneous parametric downconversion (SPDC) in a periodically-poled lithium niobate (PPLN) ridge waveguide. With one photon at 1312 nm (telecom O-band) and one photon at 1557 nm (telecom C-band) the source is suitable for long distance quantum communication applications. Furthermore, both channels can be filtered down to a standard channel spacing of 100 GHz with fiber-based filter systems. The source features a good efficiency, which is confirmed by photon pair rates up to 1 MHz with a heralding efficiency of 30%. At the same time we benefit from a conversion efficiency of about 10−6 resulting in high signal-to-background ratios. The heralded single photon properties are confirmed by photon statistics measurements with a Click/No–Click method and by the heralded g(2)–function. A minimum value for g(2)(0) of 0.04 indicating a clear antibunching has been observed.