Rack‐Integrated Quantum Dot‐Based Source of Single and Entangled Photons at Telecom C‐Band
- 1Institut für Halbleiteroptik und Funktionelle Grenzflächen Center for Integrated Quantum Science and Technology (IQ) and SCoPE University of Stuttgart Stuttgart Germany
- 2Julius‐Maximilians‐Universität Würzburg Physikalisches Institut and Würzburg‐Dresden Cluster of Excellence ctd.qmat Würzburg Bavaria Germany
- 3Institute of Photonics and Quantum Electronics (IPQ) and Center for Integrated Quantum Science and Technology (IQST) Karlsruhe Institute of Technology (KIT) Karlsruhe Germany
Abstract
Bringing quantum light sources into real‐world telecommunication networks requires moving beyond the laboratory and developing sources that operate at the telecom C‐band. Epitaxial quantum dots (QDs) provide deterministic sources of quantum light at these wavelengths. Here, we demonstrate an important step toward quantum communication networks: a state‐of‐the‐art semiconductor QD source, exhibiting a record coincidence rate for entangled‐photon emission in the telecom C‐band, integrated into an optimised rack‐based setup exhibiting remote controle. This setup includes a tunable pulsed laser for QD excitation, enabling operation from quasi‐resonant to resonant two‐photon excitation, all‐optical excitation suppression, and QD signal coupling into single‐mode fibres. Overall, the setup achieves more than 65% transmission for both exciton and biexciton photons. To demonstrate the usability of our stand‐alone source, we transmit single photons through a deployed 36 km‐long fibre link and verify that their single‐photon purity is preserved. Moreover, based on the measured entangled‐photon pair rate, we estimate that the source could enable entangled QKD protocols with a projected secret key rate 3.4 cps after 150 km of optical fibres. These results demonstrate the potential of quantum‐dot‐based telecom light sources for integration into existing fibre infrastructures, paving the way toward the realisation of a quantum internet.
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BibTeX
@article{vyvlecka2026rackintegrated,
title = {{Rack‐Integrated Quantum Dot‐Based Source of Single and Entangled Photons at Telecom C‐Band}},
author = {Michal Vyvlecka and Raphael Joos and Benjamin Breiholz and Emma Marmasse and Anna Friederike Köhler and Ponraj Vijayan and Tobias Huber‐Loyola and Sven Höfling and Michael Jetter and Simone Luca Portalupi and Peter Michler},
journal = {Nanophotonics},
year = {2026},
month = nov,
doi = {10.1002/nap2.70353},
url = {https://doi.org/10.1002/nap2.70353},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Rack‐Integrated Quantum Dot‐Based Source of Single and Entangled Photons at Telecom C‐Band
AU - Michal Vyvlecka
AU - Raphael Joos
AU - Benjamin Breiholz
AU - Emma Marmasse
AU - Anna Friederike Köhler
AU - Ponraj Vijayan
AU - Tobias Huber‐Loyola
AU - Sven Höfling
AU - Michael Jetter
AU - Simone Luca Portalupi
AU - Peter Michler
PY - 2026
DA - 2026/11/03
JO - Nanophotonics
DO - 10.1002/nap2.70353
UR - https://doi.org/10.1002/nap2.70353
AB - Bringing quantum light sources into real‐world telecommunication networks requires moving beyond the laboratory and developing sources that operate at the telecom C‐band. Epitaxial quantum dots (QDs) provide deterministic sources of quantum light at these wavelengths. Here, we demonstrate an important step toward quantum communication networks: a state‐of‐the‐art semiconductor QD source, exhibiting a record coincidence rate for entangled‐photon emission in the telecom C‐band, integrated into an optimised rack‐based setup exhibiting remote controle. This setup includes a tunable pulsed laser for QD excitation, enabling operation from quasi‐resonant to resonant two‐photon excitation, all‐optical excitation suppression, and QD signal coupling into single‐mode fibres. Overall, the setup achieves more than 65% transmission for both exciton and biexciton photons. To demonstrate the usability of our stand‐alone source, we transmit single photons through a deployed 36 km‐long fibre link and verify that their single‐photon purity is preserved. Moreover, based on the measured entangled‐photon pair rate, we estimate that the source could enable entangled QKD protocols with a projected secret key rate 3.4 cps after 150 km of optical fibres. These results demonstrate the potential of quantum‐dot‐based telecom light sources for integration into existing fibre infrastructures, paving the way toward the realisation of a quantum internet.
SN - 2192-8614
ER -