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This study presents a practical advancement in quantum communication by demonstrating a four-channel frequency-division multiplexed CV-QKD system that significantly boosts secret key rates over 26.8 km despite inter-channel interference. The experimental validation of optimized channel spacing for low-symbol-rate signals offers a viable pathway toward higher spectral efficiency and scalability for future secure quantum networks.
Frequency-Division Multiplexed CV-QKD System
arXiv:2603.20718v2 Announce Type: replace Abstract: We propose a frequency-division multiplexed (FDM) continuous-variable quantum key distribution (CV-QKD) system with enhanced spectral efficiency through optimized channel spacing of low-symbol-rate signals. A four-channel 10-Mbaud FDM-CV-QKD system was experimentally demonstrated using Gaussian modulation, a transmitted local oscillator, and homodyne detection. Despite the inter-channel interference, under a finite-size scenario (m=1.25x10^6), the system achieved a 3.6-fold back-to-back secret key rate gain and outperformed the single-channel frequency-upconverted signal up to 26.8 km.
Abstract:We propose a frequency-division multiplexed (FDM) continuous-variable quantum key distribution (CV-QKD) system with enhanced spectral efficiency through optimized channel spacing of low-symbol-rate signals. A four-channel 10-Mbaud FDM-CV-QKD system was experimentally demonstrated using Gaussian modulation, a transmitted local oscillator, and homodyne detection. Despite the inter-channel interference, under a finite-size scenario (m=1.25x10^6), the system achieved a 3.6-fold back-to-back secret key rate gain and outperformed the single-channel frequency-upconverted signal up to 26.8 km.
Quantum Physics (quant-ph); Cryptography and Security (cs.CR)
arXiv:2603.20718 [quant-ph]
(or arXiv:2603.20718v2 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2603.20718 Focus to learn more arXiv-issued DOI via DataCite
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