CZQCI will deploy quantum communication infrastructure (QCI) in the Czech Republic. The infrastructure composed of advanced experimental European QKD devices will comprise: (a) backbone connecting the cities of Prague, Brno, and Ostrava, serving as a first long distance quantum communication network; (b) metropolitan side branches connecting public authorities and testing advanced use cases and scenarios; (c) advanced testing and training infrastructure concentrated in a single laboratory providing a representative sample of diverse QKD technologies.