Coherent control and high purity single-photon emission from telecom quantum dots on metamorphic InGaAs
Abstract
Semiconductor quantum dots emitting in the telecommunication O- and C-bands are promising candidates as single-photon sources for fiber-based quantum communication. In this work, we show how coherent quasi-resonant and phonon-assisted excitation help reveal the intrinsic optical properties of InAs quantum dots embedded in relaxed InGaAs matrices on top of metamorphic InGaAs layers for achieving emission in the telecom bands. By systematically comparing excitation schemes, we separate excitation-induced effects from intrinsic emitter properties. This allows us to observe linewidths as narrow as 21 μeV, the disappearance of slow decay channels, and single-photon purity reaching second-order autocorrelation values in the order of 10−2. Photoluminescence excitation reveals higher excited states, enabling coherent control of trion transitions and the observation of Rabi-like oscillations in both telecom bands. These results confirm the promising potential of these quantum dots for applications in quantum technologies.
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BibTeX
@misc{costa2026coherent,
title = {{Coherent control and high purity single-photon emission from telecom quantum dots on metamorphic InGaAs}},
author = {Beatrice Costa and Bianca Scaparra and Hubert Riedl and Gregor Koblmüller and Eugenio Zallo and Jonathan J. Finley and Lukas Hanschke and Kai Müller},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.38060},
eprint = {2610.38060},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.38060},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Coherent control and high purity single-photon emission from telecom quantum dots on metamorphic InGaAs
AU - Beatrice Costa
AU - Bianca Scaparra
AU - Hubert Riedl
AU - Gregor Koblmüller
AU - Eugenio Zallo
AU - Jonathan J. Finley
AU - Lukas Hanschke
AU - Kai Müller
PY - 2026
DA - 2026/10/27
PB - arXiv
DO - 10.48550/arxiv.2610.38060
UR - https://arxiv.org/abs/2610.38060
AB - Semiconductor quantum dots emitting in the telecommunication O- and C-bands are promising candidates as single-photon sources for fiber-based quantum communication. In this work, we show how coherent quasi-resonant and phonon-assisted excitation help reveal the intrinsic optical properties of InAs quantum dots embedded in relaxed InGaAs matrices on top of metamorphic InGaAs layers for achieving emission in the telecom bands. By systematically comparing excitation schemes, we separate excitation-induced effects from intrinsic emitter properties. This allows us to observe linewidths as narrow as 21 μeV, the disappearance of slow decay channels, and single-photon purity reaching second-order autocorrelation values in the order of 10^−2. Photoluminescence excitation reveals higher excited states, enabling coherent control of trion transitions and the observation of Rabi-like oscillations in both telecom bands. These results confirm the promising potential of these quantum dots for applications in quantum technologies.
ER -