Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology
Q 16.21: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
Parametric down-conversion sources for applications in quantum information — •Sabine Euler1,2 and Thomas Walther1,2 — 1Institut für Angewandte Physik, AG Laser und Quantenoptik, TU Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt — 2Cased, Mornewegstraße 32, 64293 Darmstadt
We present type-II parametric down-conversion (PDC) processes in different PPKTP waveguide-chips pumped by a cw diode laser @404nm.
By manipulating the temperature of the PPKTP chips and the coupling of the pump laser we are able to control the produced photon pairs and either prepare a separable two-photon state or an entangled one. The quantum state of the photon pairs is detected by a Hong-Ou-Mandel interference between signal and idler photon.
Two different applications are based on our single photon sources: In a first experiment the BB84 protocol for quantum key distribution is implemented only by the use of passive optical components. The second experiment aims at implementing a source of two identical photons. 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.