The project represents the next implementation phase of the European Quantum Communication Infrastructure (EuroQCI). Following the deployment of National Quantum Communication Infrastructures (NatQCIs) across Member States, the focus now moves toward interconnecting these networks, validating interoperability, and delivering cross-border quantum communication services.
SEEWQCI is a landmark cross-border initiative that interconnects the National Quantum Communication Infrastructures of Greece (HellasQCI), Cyprus (CYQCI), Bulgaria (BGQCI) and the Netherlands (NL-QCI), establishing a scalable quantum corridor for secure data transmission across South-Eastern and Western Europe.
SEEWQCI establishes a 1,100 km cross-border terrestrial QKD backbone between Greece and Bulgaria, positioning Greece as the gateway of the South-East Europe Quantum Corridor and laying the foundation for expansion toward Central and Western Europe. In parallel, the project deploys satellite and hybrid quantum connectivity through five Optical Ground Stations, enabling space-based links between Greece, the Netherlands, and Cyprus, as well as hybrid terrestrial–space connections between Bulgaria, the Netherlands, and Cyprus via Greece.
Building Europe’s Quantum-Secure Backbone
As part of the second implementation phase of the European Quantum Communication Infrastructure (EuroQCI), SEEWQCI contributes to a continental network combining:
This hybrid terrestrial-space architecture will enable the secure transmission of sensitive data.
Project Scale & European Cooperation
SEEWQCI is implemented by a consortium of 15 core partners and 7 supporting organisations from Greece, Cyprus, Bulgaria and the Netherlands, including:
The project will deploy a 1,100 km terrestrial QKD corridor, integrate five Optical Ground Stations, and implement more than 29 quantum-secure use cases across over 35 trusted nodes, testing terrestrial, satellite and hybrid connectivity scenarios.
