SKM 2021 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 18: Quantum Dots and Wires (joint session HL/TT)
HL 18.5: Vortrag
Donnerstag, 30. September 2021, 14:45–15:00, H4
Resonance fluorescence of single In(Ga)As quantum dots emitting in the telecom C-band — •Julius Fischer, Cornelius Nawrath, Hüseyin Vural, Richard Schaber, 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, Germany
Quantum dots represent a rapidly developing platform as sources of non-classical states of light for tackling quantum communication and computation tasks. Especially quantum dots emitting in the telecom C-band (1530nm-1565nm) are promising candidates due to the low absorption losses in the existent telecommunication fiber network.
In this study, we investigate In(Ga)As quantum dots emitting in the telecom C-band under resonant excitation to examine coherence properties and to investigate their single-photon purity as well as photon indistinguishability. Under strong resonant cw excitation, high-resolution fluorescence spectra, namely the Mollow triplet, of a single quantum dot are investigated. These spectra, in combination with a comprehensive fitting procedure, are used as a method to quantitatively attribute decoherence processes and thus presenting an excellent method to provide important insights for future sample optimizations. In addition, under pulsed resonant excitation, the capability of emitting highly pure single photons (g(2)(0) = 0.023 ± 0.019) with a non-postselected indistinguishability of subsequently emitted photons of VTPI = 0.144 ± 0.015 is demonstrated.