Hannover 2013 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 68: Quantum information: Photons and nonclassical light II

Q 68.3: Talk

Friday, March 22, 2013, 14:30–14:45, F 142

A Versatile Photon Pair Source for Quantum Circuits — •Vahid Ansari, Georg Harder, Benjamin Brecht, and Christine Silberhorn — Applied Physics, University of Paderborn, Warburger Straße 100, 33098 Paderborn, Germany

Efficient generation of indistinguishable single photons in pure quantum states is key to many applications in quantum information processing. We present an ultrafast pulsed parametric down conversion (PDC) source based on a degenerate type-II PDC in a PP-KTP waveguide at telecommunication wavelengths. As such, our highly efficient source generates close to perfect single-mode photon pairs with indistinguishable mode properties. As a measure of indistinguishability we observe Hong-Ou-Mandel interference between signal and idler with a visibility of 95.6%, without narrow-band filtering. We further demonstrate the purity of signal and idler by HOM interference between signal/idler and a weak coherent field. The results are in excellent agreement to the spectral and modal characterization as well as to theory.