Towards fully-fledged quantum and classical communication over deployed fiber with up-conversion module
Davide Bacco, Ilaria Vagniluca, Daniele Cozzolino, S{\o}ren M. M., Friis, Lasse H{\o}gstedt, Andrea Giudice, Davide Calonico, Francesco Saverio, Cataliotti, Karsten Rottwitt, Alessandro Zavatta

TL;DR
This paper introduces an up-conversion assisted receiver for quantum key distribution over fiber, significantly improving noise tolerance and enabling co-propagation of quantum and classical signals at higher power levels.
Contribution
It presents a novel up-conversion based receiver that enhances co-propagation of quantum and classical signals in fiber networks, surpassing standard detectors in noise tolerance.
Findings
Achieves 4 dB higher classical power tolerance compared to standard receivers.
Demonstrates successful quantum key distribution over installed fiber links.
Shows improved performance in co-propagating quantum and classical signals.
Abstract
Quantum key distribution (QKD), the distribution of quantum secured keys useful for data encryption, is expected to have a crucial impact in the next decades. However, although the notable achievements accomplished in the last twenty years, many practical and serious challenges are limiting the full deployment of this novel quantum technology in the current telecommunication infrastructures. In particular, the co-propagation of quantum signals and high-speed data traffic within the same optical fiber, is not completely resolved, due to the intrinsic noise caused by the high intensity of the classical signals. As a consequence, current co-propagation schemes limit the amount of classical optical power in order to reduce the overall link noise. However, this ad-hoc solution restrains the overall range of possibilities for a large-scale QKD deployment. Here, we propose and demonstrate a…
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