Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 22: Photon Sources for Quantum Networks SYQR 4 (with Q)
A 22.3: Talk
Tuesday, March 18, 2014, 14:30–14:45, Kinosaal
Two Photon Interference from Remote Quantum Dots with Inhomogeneously Broadened Linewidths — •Peter Gold1, Alexander Thoma1, Sebastian Maier1, Stephan Reitzenstein1,2, Sven Höfling1,3, Christian Schneider1, and Martin Kamp1 — 1Technische Physik, Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany — 2present address: Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, D-10623 Berlin, Germany — 3present address: SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, KY16 9SS, United Kingdom
The interference of single, indistinguishable photons is at the heart of long distance quantum repeaters. Here, we investigate the influence of non-resonant and quasi-resonant excitation on the interference properties of single photons emitted from semiconductor quantum dots (QDs). For the quasi-resonant excitation scheme, we observe an increase of interference visibility for consecutively emitted photons from the same QD of 69% compared to 12% for non-resonant excitation. In addition, we demonstrate quantum interference of photons emitted from separate QDs simultaneously excited into their p-shell. We can extract a two photon interference visibility as high as (39±2)% for non-postselected coincidences. This value exceeds the predicted value based on coherence and radiative decay times of the quantum dot emission (≈ 25%). We account for this by treating the emission of both quantum dots as inhomogeneously broadened ensembles of Fourier limited photons and observe good congruence between experiment and model.