Noise characterization for co-propagation of classical and CV-QKD signals over fiber and free-space link
Jo\~ao dos Reis Fraz\~ao, Vincent van Vliet, Kadir G\"um\"u\c{s},, Menno van den Hout, Sjoerd van der Heide, Aaron Albores-Mejia, Boris, \v{S}kori\'c, Chigo Okonkwo
TL;DR
This paper investigates the noise effects in co-propagating classical and CV-QKD signals over fiber and free-space links, demonstrating a high secret-key rate in a real-time CV-QKD system amidst classical channel interference.
Contribution
It provides a detailed noise characterization and performance analysis of simultaneous classical and quantum signal transmission over fiber and free-space links.
Findings
Achieved 2.9 Mbit/s secret-key-rate over 12.8 km fiber with classical channels present
Performance degrades at higher launch powers due to increased crosstalk
Demonstrates feasibility of co-propagating classical and quantum signals in practical links
Abstract
Real-time CV-QKD receiver achieves peak 2.9 Mbit/s secret-key-rates over 12.8 km of fiber, while co-propagating 15 classical channels, separated 1 nm from the quantum signal. Performance degrades at higher launch powers due to crosstalk.
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Taxonomy
TopicsOptical Network Technologies · Semiconductor Lasers and Optical Devices · Advanced Photonic Communication Systems