Frequency-Division Multiplexed CV-QKD System
The paper proposes and experimentally demonstrates a four-channel Frequency-Division Multiplexed (FDM) Continuous-Variable Quantum Key Distribution (CV-QKD) system, achieving a significant 3.7-fold gain in secret key rate compared to single-channel systems over distances up to 41.1 km.
Abstract
More Like ThisWe 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.