Non-classical light sources based on a single quantum emitter are considered as core technology for multiple quantum network architectures. A large variety of sources has been developed, but the generated photons remained far from being utilized in established standard fiber networks. Here, we report a week-long transmission of polarization-entangled photons from a single InAs/GaAs quantum dot over a metropolitan network fiber. The emitted photons are in the telecommunication O-band, favored for fiber optical communication. We employ a polarization stabilization system overcoming changes of birefringence introduced by 18.23km of installed fiber. Stable transmission of polarization-encoded entanglement with a high fidelity of 91% is achieved, facilitating the operation of sub-Poissonian quantum light sources over existing fiber networks.
@article{arxiv.1807.10690,
title = {Long-term transmission of entangled photons from single quantum dot over deployed fiber},
author = {Zi-Heng Xiang and Jan Huwer and R. Mark Stevenson and Joanna Skiba-Szymanska and Martin B. Ward and Ian Farrer and David A. Ritchie and Andrew J. Shields},
journal= {arXiv preprint arXiv:1807.10690},
year = {2020}
}