Speaker
Mr
Alexander Schlager
(Institut für Experimentalphysik, Universität Innsbruck)
Description
We create polarization entangled, spectrally broadband photon pairs from parametric down-conversion in semiconductor Bragg-reflection waveguides. We show, how to adjust the coherence of the polarization entangled states by controlling the relative temporal delay between a pair of photons with a birefringent retarder.
Otherwise, the slight temporal walk-off of the photon pair, which is caused by the highly dispersive waveguide, results in an uncompensated phase. Our experimental and theoretical results show, how the state characteristics can be tuned directly at the source, offering a simple way to optimize the degree of entanglement.
Primary authors
Mr
Alexander Schlager
(Institut für Experimentalphysik, Universität Innsbruck)
Mr
Benedikt Pressl
(Institut für Experimentalphysik, Universität Innsbruck)
Dr
Kaisa Laiho
(Institut für Experimentalphysik, Universität Innsbruck)
Mr
Holger Suchomel
(Technische Physik, Universität Würzburg)
Dr
Martin Kamp
(Technische Physik, Universität Würzburg)
Prof.
Sven Höfling
(Technische Physik, Universität Würzburg and School of Physics & Astronomy, University of St. Andrews)
Dr
Christian Schneider
(Technische Physik, Universität Würzburg)
Prof.
Gregor Weihs
(Institut für Experimentalphysik, Universität Innsbruck)
