Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 56: Focus Session: Quantum Nanophotonics in Solid State Systems II (joint session HL/TT)

TT 56.3: Talk

Wednesday, March 14, 2018, 10:15–10:30, EW 201

Quantum-optical spectroscopy of a two-level system using an electrically driven micropillar laser as resonant excitation source — •Sören Kreinberg¹, Tomislav Grbešic¹, Max Strauß¹, Alexander Carmele², Monika Emmerling³, Christian Schneider³, Sven Höfling³, Xavier Porte¹, and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik, Technische Universität Berlin, Germany — ²Institut für Theoretische Physik, Technische Universität Berlin, Germany — ³Technische Physik, Julius-Maximilians-Universität Würzburg, Germany

Two-level emitters constitute the core elements of photonic quantum systems and exploring their physics is at the heart of quantum optics. Of special interest is the strict-resonant optical excitation of such emitters to generate quantum light with close to ideal properties. Up till now related experiments have been performed exclusively using bulky lasers. This hinders the application of resonantly driven two-level emitters in quantum technology, which relies on the availability of compact sources of indistinguishable photons. Here we propose and demonstrate quantum-optical spectroscopy of a single QD embedded in a planar microcavity resonantly excited by an electrically driven high-β quantum dot micropillar laser. We obtain single photons with strong multi-photon suppression g⁽²⁾(0)=0.02 and high photon indistinguishably V=0.57(9) under pulsed excitation with a repetition rate of 156 MHz. Our results demonstrate the exquisite potential of high-β microlasers as coherent excitation sources in quantum nanophotonics and pave the way to compact, resonantly driven quantum light sources.