Frequency-Division Multiplexed CV-QKD System

Jahyeok Han; Donghyeok Le; Minseok Ryu; Syed Assad; Yong-Su Kim; Sunghyun Bae

Frequency-Division Multiplexed CV-QKD System

Quantum Physics 2026-03-24 v1 Cryptography and Security

Authors: Jahyeok Han , Donghyeok Le , Minseok Ryu , Syed Assad , Yong-Su Kim , Sunghyun Bae

Abstract

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.

Keywords

quantum key distribution

Cite

@article{arxiv.2603.20718,
  title  = {Frequency-Division Multiplexed CV-QKD System},
  author = {Jahyeok Han and Donghyeok Le and Minseok Ryu and Syed Assad and Yong-Su Kim and Sunghyun Bae},
  journal= {arXiv preprint arXiv:2603.20718},
  year   = {2026}
}

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4 pages

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