Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 26: Focus Session: Quantum light sources for applications in quantum communication networks

HL 26.2: Vortrag

Mittwoch, 3. April 2019, 10:00–10:15, H34

Influence of the excitation scheme on coherence properties of InAs/InGaAs quantum dots emitting in the telecom C-band — •Cornelius Nawrath, Fabian Olbrich, Matthias Paul, Jan Kettler, Simone Luca Portalupi, Michael Jetter, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart

The emission of semiconductor quantum dots (QDs) has been shown to exhibit excellent properties in terms of single-photon purity, photon indistinguishability and entanglement fidelity, i.e. essential prerequisites for most applications in the field of quantum computing and quantum communication. The latter will benefit strongly from emission around 1550nm (telecom C-band) due to the global absorption minimum in standard silica fibers employed in the existing global fiber network.

The coherence properties of photons emitted from InAs/InGaAs QDs, grown on a metamorphic buffer to achieve C-band emission, are examined by measurements in the frequency and time domain comparing different optical charge carrier excitation schemes, namely above the band gap of the barrier material (above-band), via the phonon sideband (phonon-assisted) and in resonance fluorescence. This work highlights the importance of quasi-resonant or resonant excitation for applications relying on good coherence.