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Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 46: Quantum dots and wires: Optical properties III

HL 46.6: Talk

Thursday, March 15, 2018, 16:30–16:45, A 151

Frequency Feedback for Two-photon Interference from Separate Quantum Dots — •Michael Zopf1, Tobias Macha2, Robert Keil1, Eduardo Uruñuela2, Yan Chen1, Wolfgang Alt2, Lothar Ratschbacher2, Fei Ding1,3, Dieter Meschede2, and Oliver G. Schmidt1,41Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany — 2Institut für Angewandte Physik, Universität Bonn, Wegelerstraße 8, 53115 Bonn, Germany — 3Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany — 4Merge Technologies for Multifunctional Lightweight Structures, Technische Universität Chemnitz, 09107 Chemnitz, Germany

We employ frequency feedback to stabilize the single-photon emission of two separate, strain-tunable quantum dots to an atomic standard. Their transmission through a single rubidium-based Faraday filter serves as an error signal for frequency stabilization to less than 1.5 % of the emission linewidth. The long-term stability is demonstrated by two-photon interference between two quantum dots. The observed visibility of Vlock=(41 ± 5) % agrees with theoretical predictions. Our approach facilitates the way towards quantum networks with indistinguishable photons from different emitters.

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