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Are Frontier LLMs Ready for Cybersecurity? 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Frequency-Division Multiplexed CV-QKD System
[Submitted on 21 Mar 2026 (v1), last revised 16 Jun 2026 (this v · 2026-06-17 · via cs.CR updates on arXiv.org

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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.

Submission history

From: Sunghyun Bae [view email]
[v1] Sat, 21 Mar 2026 08:54:04 UTC (2,034 KB)
[v2] Tue, 16 Jun 2026 09:31:01 UTC (1,458 KB)