Fig. 5: Experimental results of encryption key renewal transmission.
From: Partial coherence and multi-channel vortices enhance high-security free-space optical communication
a Visualization process of time-division-based encryption key renewal transmission, represented by keys of different colors. The results comprise the transmitted and received grayscale images, the corresponding BERs, and pixel-value confusion scatter plots. b The correlation of different colors of key and encryption trajectories.
