Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 31: Poster: Quantum Optics and Photonics II
Q 31.55: Poster
Tuesday, March 24, 2015, 17:00–19:00, C/Foyer
Parametric down-conversion sources for applications in quantum information — •Sabine Euler1,2, Stephanie Lehmann1, and Thomas Walther1,2 — 1TU Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt — 2CASED, Mornewegstraße 32, 64293 Darmstadt
We present two different applications for a type-II parametric down-conversion (PDC) process in PPKTP waveguide-chips pumped by a cw diode laser around 404nm. In a first experiment the twin-photons are prepared according to the BB84 protocol for quantum key distribution. Based only on passive optical components our approach offers a possibility to authenticate the quantum channel of the communication using two-photon interference effects. The second experiment aims at implementing a source of two identical photons by a stimulated process. One of the PDC photons is fed back into the chip where in a difference frequency generation (DFG) process between a pump photon @404nm and the single PDC photon @808nm two additional red photons are generated. We will discuss the current state of the experiments.