Security Enhanced 214 Gbps 216-QAM Y-00 Quantum Noise Stream Cipher System Based on Quantum Phase Diffusion

Key Points

• The system achieved a transmission speed of 214Gbps over 50km of SSMF, showing efficient performance.
• Masking information bits effectively prevents low-order demodulation attacks, with minimal impact on performance.
• The demonstrated optical power penalty was only 0.5dB, indicating robust communication quality.
• Use of quantum phase diffusion enhances the security of the cipher system against current threats.