Modular Facility of Quantum Key Distribution in a Free Space

The possibility of implementing the technology of quantum key distribution on discrete variables in free space is demonstrated. The experimental setup is based on mass produced equipment – terminals for atmospheric optical communication lines and the scientific and educational complex EMQOS 1.0. The latter is designed for conducting educational and research work in the field of quantum optics. The nodes that need to be modified in equipment have been identified. Both terminals for atmospheric optical communication lines and quantum key distribution units were modified accordingly in order to implement the modular principle of building quantum communication systems in the atmosphere.