Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 39: Focus Session: Quantum Nanophotonics in Solid State Systems I (joint session HL/TT)

TT 39.6: Talk

Tuesday, March 13, 2018, 11:45–12:00, EW 201

Temporally adjustable photon pairs from semiconductor waveguides — •K. Laiho^1,2, B. Pressl², A. Schlager², S. Auchter², H. Chen², T. Günthner², H. Suchomel³, J. Gessler³, M. Kamp³, S. Höfling^3,4, 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.