 Discrete modulation continuous variable, CV, quantum key distribution has the potential for large-scale deployment in secure quantum communication networks due to its low implementation complexity and compatibility with the current coherent optical telecommunications. By optimizing the key map and numerical convex optimization techniques, it is possible to achieve a high key rate comparable to the Gaussian modulation protocol at 50 kilometers with only 12 coherent states. This approach makes discrete modulation CV quantum key distribution an attractive alternative for high rate and low cost applications in secure quantum communication networks. This article was authored by Piyu Wang, Yu Zhong, Zheng Guolu, and others.