Frequency-Division Multiplexed CV-QKD System

Quantum Physics [Submitted on 21 Mar 2026] Frequency-Division Multiplexed CV-QKD System Jahyeok Han, Donghyeok Le, Minseok Ryu, Syed Assad, Yong-Su Kim, Sunghyun Bae We propose a frequency-division multiplexed (FDM) continuous-variable quantum key distribution (CV-QKD) system with enhanced spectral efficiency through dense multiplexing 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. Under a finite-size scenario (N = 10^7), the system achieved a 3.7-fold back-to-back secret key rate gain and outperformed the single-channel system for distances up to 41.1 km. Comments: 4 pages Subjects: Quantum Physics (quant-ph); Cryptography and Security (cs.CR) Cite as: arXiv:2603.20718 [quant-ph]   (or arXiv:2603.20718v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2603.20718 Focus to learn more Submission history From: Sunghyun Bae [view email] [v1] Sat, 21 Mar 2026 08:54:04 UTC (2,034 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-03 Change to browse by: cs cs.CR References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)