Hannover 2013 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster I

Q 35.55: Poster

Tuesday, March 19, 2013, 16:00–18:30, Empore Lichthof

Implementation of a waveguide based source of polarization entangled photon pairs — •Xu Yang, Harald Herrmann, Abu Thomas, Wolfgang Sohler, and Christine Silberhorn — Universität Paderborn, Integrierte Quantenoptik, Warburger Str. 100, D-33098 Paderborn

We designed and demonstrate an integrated source of entangled photon pairs based on spontaneous parametric downconversion (PDC) in a periodically poled Ti:LiNbO3 waveguide with Type-II quasi-phase-matching. The waveguide consists of two specially tailored interlaced periodicities to allow for two different phase-matched PDC processes exhibiting identical non-degenerate frequencies, but interchanged polarizations for the signal and idler photons. Thus the direct generation of polarization entangled state can be obtained at the output of the waveguide. Using standard polarization maintaining fibers we compensated the temporal walk-off caused by the birefringence of the crystal. Subsequent wavelength dependent splitting of the photon pairs was implemented by using a fiber based coarse wavelength division multiplexer. We characterized the polarization entangled photon pair by performing the two-photon interference and observe a visibility as high as of 95%, and a measured value of 2.57*0.06 of the Bell's inequality, with a violation of more than 9 standard deviations.