Quantum Noise Stream Cipher Scheme Based on 3-Channel-QAM With 3D Mapping and DFTs-OFDM

In this letter, we conduct an experiment of quantum noise stream cipher scheme based on 3-channel-QAM mapping and DFTs-OFDM in optical back-to-back and 160km standard single mode fiber. The fusion of 3D mapping and DFTs-OFDM offers sufficient security for QAM/QNSC within the dual polarization I/Q modulator system. Notably, the proposed 3D-mapping approach demonstrates improved minimum Euclidean distance and bit error rate performance compared to conventional 2D mapping. Experimental results confirm that our 3-channel-QAM/QNSC system achieves better transmission and higher security performance at the same base length than conventional QAM/QNSC.