Bulgaria and Romania Launch Construction of a Cross-Border Quantum Communication Link: A New Stage in the Digital Security of South-Eastern Europe

On 19 March 2026, the construction of the first cross-border quantum communication infrastructure between Bulgaria and Romania was officially launched in Sofia. The ceremony took place at the Institute of Robotics of the Bulgarian Academy of Sciences, with the participation of representatives of the Bulgarian government, the European Commission, scientific institutions, as well as the diplomatic missions of Romania and Greece. The new connection is expected to link Sofia and Bucharest and become one of the key segments of the future pan-European quantum communication infrastructure.

According to the Bulgarian side, the new channel will provide a secure communication environment for government institutions, research organisations, and strategic enterprises in the region. The Bulgarian Academy of Sciences emphasized that the project is part of a broader European Union initiative aimed at creating a secure communication environment for public institutions, science, and critical infrastructure.

Borislav Bankov, Deputy Minister of Innovation and Growth of Bulgaria, stated that the connection with Bucharest will create a secure channel for public institutions, research organisations, and strategic enterprises, while also laying the foundation for the development of quantum services in the fields of digital transformation, cybersecurity, and Europe’s technological sovereignty. In the longer term, this corridor is expected to integrate the national quantum infrastructures of Greece, Bulgaria, Cyprus, Romania, and the Netherlands.

The European Commission defines EuroQCI as a pan-European secure quantum communication infrastructure covering the entire EU and combining a terrestrial segment based on fibre-optic networks with a space segment based on satellites. The purpose of the initiative is to protect sensitive data and critical infrastructure through the integration of quantum technologies into existing communication systems. The Commission explicitly states that this includes strengthening the protection of government institutions, data centres, hospitals, energy grids, and other critical systems.

IDR Commentary

The launch of the Bulgarian-Romanian quantum corridor should be viewed not only as a technological event, but also as an element in the formation of a new architecture of strategic security in Europe. Under current conditions, digital sovereignty is increasingly defined not only by the availability of data centres, optical networks, or cloud services, but also by the ability of states to ensure the secure transmission of critically important information at the interstate level.

At the Institute of Danube Research, it is noted that this project is of particular importance for South-Eastern Europe. First, it strengthens the technological role of Bulgaria and Romania as countries gradually moving from a peripheral status toward the function of nodes of European infrastructure integration. Second, the new quantum line creates the preconditions for the deeper inclusion of the region in systems protecting governmental communications, critical infrastructure, energy networks, transport corridors, and scientific centres. Third, such infrastructure forms the basis for a future market of quantum services, in which those states that are the first to integrate into next-generation European networks will enjoy a strategic advantage. This is an analytical conclusion based on the declared objectives of EuroQCI and the parameters of the Bulgarian-Romanian project.

In geopolitical terms, one may speak of the strengthening of the South-Eastern Europe – Central Europe – Western Europe axis. If the declared scale is implemented, Bulgaria may indeed reinforce its role as a regional node in the pan-European quantum architecture, while Romania may become a key element linking the Black Sea and Central European spaces of secure digital exchange. For this reason, the project should be assessed not merely as an investment in telecommunications, but also as an investment in the long-term resilience of Europe’s security, scientific, and institutional environment.