Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 16: Focussed Session: Quantum Nanophotonics in Solid State Systems: Status, Challenges and Perspectives I (joint session HL/TT)
HL 16.6: Vortrag
Dienstag, 13. März 2018, 11:45–12:00, EW 201
Temporally adjustable photon pairs from semiconductor waveguides — •K. Laiho1,2, B. Pressl2, A. Schlager2, S. Auchter2, H. Chen2, T. Günthner2, H. Suchomel3, J. Gessler3, M. Kamp3, S. Höfling3,4, C. Schneider3, and G. Weihs2 — 1Technische Universität Berlin, Institut für Festkörperphysik, Hardenbergstr. 36, 10623 Berlin, Germany — 2Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, 6020 Innsbruck, Austria — 3Technische Physik, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 4School of Physics & Astronomy, University of St Andrews, St Andrews KY16 9SS, UK
Semiconductor Bragg-reflection waveguides (BRWs) are efficient photon-pair sources and well suited for integrated optics. These monolithic structures are made of AlGaAs and profit from its strong second order optical non-linearity. Our BRWs rely on type-II parametric down-conversion (PDC) achieved via spatial mode matching.
In order to become truly practical, BRWs need to be reliably fabricated and applicable in various quantum optics tasks. Our simulations show that too coarse tolerances in fabrication easily distort the design properties. Further, we experimentally investigate the characteristics of PDC emission, verify the indistinguishability of photon pairs and prepare polarization entangled states with a temporally adjustable degree of entanglement [1]. To conclude, a careful study of the PDC process parameters is necessary for controlling and manipulating the BRW’s performance in the investigated tasks.
[1] A. Schlager et al., Opt Lett. 42, 2102 (2017) and references therein.