The success of the initiative lies in the broad consortium of entities that comprise it, including the Spanish Metrology Center, the Vithas Foundation, the IMDEA Networks and IMDEA Software institutes, the National Institute of Aerospace Technology, and the Autonomous University of Madrid, the Complutense University of Madrid, and the Polytechnic University of Madrid. The latter coordinated the project in the region, which was part of the Complementary Plan in Quantum Communication, also coordinated nationally by UPM in conjunction with ICFO.
Among its main achievements is the deployment of a quantum network in the region, along with remarkable advances in secure communications and the development of new quantum computing applications. All of this has contributed to creating an environment that integrates research, industry, and institutions to drive future quantum information networks, the foundation of the so-called quantum internet.
One of the project's most significant milestones has been the development of the MadQCI ecosystem, an interconnected network of quantum networks in the Madrid metropolitan area. Its objective is to provide quantum connectivity to all public universities in the region, research centers, and other institutional headquarters, enabling the testing of quantum technology applications such as ultra-secure communications, data protection in cloud environments, and satellite connections.
In total, the infrastructure connects 30 locations via more than 700 kilometers of fiber optic links and has been interconnected with experimental networks of technology companies such as Indra and Telefónica Innovación Digital, positioning Madrid as a strategic hub for quantum network technologies and their application to cybersecurity in Europe, in line with the EuroQCI initiative.
Technological advances with real impact:
The project has achieved innovations throughout the entire quantum communications lifecycle, from physical devices to network management. Of particular note is the integration of quantum key distribution (QKD) systems, a technology that protects communications from other quantum or disruptive technologies. QKD systems from all manufacturers have been integrated into the European ecosystem. Also key have been the advancements in satellite quantum links within the Q ANSER mission, including space-qualified polarization tracking systems, and in tools for controlling complex networks.
In parallel, the project has fostered advances in quantum information processing, with applications in computing, sensing, and future distributed networks. For example, the Spanish Metrology Center has created a quantum optical frequency standard with the potential to distribute ultra-precise and more secure timing signals across the fiber optic network. Furthermore, algorithms and techniques based on artificial intelligence have been implemented to optimize quantum systems, with milestones such as the estimation of gravitational wave parameters using quantum computing and the improvement of circuits in real hardware.
From Research to Use Cases:
One of MADQuantum-CM's distinguishing features has been its focus on technology transfer and validation in real-world environments. Among its most significant demonstrators are the secure connection between hospitals in the Vithas group and projects with Banco Santander, integrating advanced cryptography and digital services in operational scenarios.
Furthermore, the "MADQ Business Venture" program has been launched to foster new business initiatives in the quantum field and strengthen the industrial ecosystem. This program has combined competitions to showcase innovative solutions from startups and spin-offs with specialized training.
