[Submitted on 13 March 2026] A new preprint of a literature review on digital engineering, particulary on the digital-twin aspect of quantum communication networks, has been published on engrxiv. Amal Elsokary, Hayato Ishida, Catherine White, Stephen Powley, Maria Aslam, Michael Henshaw, and Siyuan Ji Abstract: Research on quantum communication networks has grown rapidly in recent years, driven by progress in quantum devices, simulators, and experimental testbeds. As these sy