MADQuantum-CM has come to an end, consolidating the Community of Madrid as a national and international benchmark in quantum technologies. The project combined research in cryptography, quantum communications, and quantum information processing with knowledge transfer initiatives and support for entrepreneurship.

The initiative’s success lies in the broad consortium of entities involved, including the Spanish Centre of Metrology, the Vithas Foundation, the IMDEA Networks and IMDEA Software institutes, the National Institute for Aerospace Technology, and the Autonomous University of Madrid, Complutense University of Madrid, and Polytechnic University of Madrid (UPM). The latter coordinated the project in the region, within the framework of the Complementary Plan for Quantum Communication, also coordinated nationally by UPM together with ICFO.

Among its main achievements is the deployment of a quantum network across the region, alongside significant 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, forming the basis of the so-called quantum internet.

One of the project’s most significant milestones has been the development of the MadQCI ecosystem, an infrastructure of interconnected quantum networks across the Madrid metropolitan area. Its goal is to provide quantum connectivity to all public universities in the region, research centers, and other institutional sites, enabling the testing of quantum technology applications such as ultra-secure communications, cloud data protection, and satellite connections.

In total, the infrastructure connects 30 locations through more than 700 kilometers of optical fiber links and has been interconnected with experimental networks from technology companies such as Indra and Telefónica Innovación Digital. This positions 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-World Impact

The project achieved innovations across the entire quantum communications cycle, from physical devices to network management. Particularly noteworthy is the integration of quantum key distribution (QKD) systems, a technology that protects communications even against quantum or other disruptive technologies. QKD systems from all manufacturers within the European ecosystem have been integrated into the network.

Progress in satellite quantum links within the Q ANSER mission has also been crucial, including space-qualified polarization tracking systems and tools for managing complex networks.

At the same time, the project promoted advances in quantum information processing, with applications in computing, sensing, and future distributed networks. For example, the Spanish Centre of Metrology developed a quantum optical frequency standard with the potential to distribute ultra-precise and more secure timing signals through fiber optic networks.

In addition, algorithms and techniques based on artificial intelligence were implemented to optimize quantum systems, achieving milestones such as the estimation of gravitational wave parameters using quantum computing and the improvement of circuits on real hardware.

One of MADQuantum-CM’s distinguishing features has been its focus on technology transfer and validation in real-world environments. Among its most important demonstrators are the secure connection between hospitals within the Vithas group and projects with Banco Santander, integrating advanced cryptography and digital services into operational scenarios.

The project also launched the “MADQ Business Venture” program, aimed at fostering new business initiatives in the quantum sector and strengthening the industrial ecosystem. The program combined competitions showcasing innovative solutions from startups and spin-offs with specialized training.

With these achievements, MADQuantum-CM leaves behind an operational infrastructure, advanced technological capabilities, and a collaborative network integrating research, industry, and institutions. Madrid has therefore taken a decisive step toward secure communications and the future quantum internet in Spain and Europe.