Researchers at QuTech, a collaboration between TU Delft and TNO, achieved a quantum connection over 25 km of optical fiber between quantum processors in Delft and The Hague. This connection marks a major leap from lab-bound experiments to a real-world quantum network. The setup required innovations in independent node operation and photon-efficient protocols, overcoming significant challenges like photon loss over long distances.

This milestone offers a glimpse of future quantum networks capable of sharing quantum information across cities. By leveraging entanglement, quantum networks could soon enable ultra-secure encryption, connect quantum computers, and set a solid foundation for a European quantum internet.