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Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 109: Quantum dots and wires: Quantum communication and quantum information science

HL 109.4: Talk

Friday, March 20, 2015, 12:00–12:15, ER 164

Ultra-bright emission of indistinguishable photons from deterministic quantum-dot microlenses — •Alexander Thoma, Peter Schnauber, Manuel Gschrey, Marc Seifried, Ronny Schmidt, Jan-Hindrik Schulze, Tobias Heindel, Sven Rodt, André Strittmatter, and Stephan Reitzenstein — Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, D-10623, Germany

Non-classical light sources emitting single indistinguishable photons at high flux rates are key components for concepts in the field of quantum information technology such as the quantum repeater. Single self-organized semiconductor quantum dots (QDs) integrated into microcavity systems are promising candidates to realize such sources. In recent years significant progress has been achieved in this field, however, most of the realized devices are based on spatially and spectrally random quantum emitters. In this work we report on a versatile device concept that is based on deterministically fabricated single QD microlenses using in-situ electron beam lithography. These quantum light sources can be realized with very high process yield >90% and allow for ultrabright emission on demand. We observe photon extraction efficiencies of up to (23.3 ± 3.0)% in combination with a strong suppression of multi-photon emission events g(2)(0)<0.01. A Hong-Ou-Mandel-type two-photon interference experiment reveals a visibility of V=(43 ± 4)% even in saturation of the active QD.

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