The project delivered two important advances. First, we developed a new Coherent Control method that stabilises phase references in two-colour EPR entanglement sources without compromising their quantum properties. This innovation improves Bell-state measurements and significantly enhances the performance of the source, making it competitive with the best technologies available today. Second, we demonstrated that an optical EPR state can be coupled to an atomic spin oscillator without degrading the quantum features of either system. This result, published in Nature, shows that hybrid quantum interfaces are feasible and can be used to manipulate quantum states of light through atomic systems.
These achievements have clear potential impacts. They open the way to hybrid quantum networks, which are essential for implementing quantum repeaters and secure communication protocols. They also provide tools for reducing quantum noise in gravitational wave detectors, a strategic area for Europe’s scientific leadership. However, to ensure full uptake and success, further steps are needed. Completing the unconditional teleportation from atoms to light remains a priority, as does scaling the technology for integrated photonic platforms. Industrial adoption will require miniaturisation, intellectual property protection for the Coherent Control technique, and engagement with quantum technology companies. Access to finance and partnerships through initiatives like the EU Quantum Flagship will be crucial, as will the development of interoperability standards to integrate these systems with existing telecom infrastructure. Finally, international collaboration will help accelerate adoption and maintain competitiveness in the global quantum technology race.
