Scientists create scalable quantum node linking light and matter

Researchers at the University of Innsbruck have created a scalable quantum network node using ten calcium ions in a prototype quantum computer. By moving ions into an optical cavity where laser pulses trigger photon emission, they achieved 92% ion-photon entanglement fidelity—a significant improvement over previous experiments that could only link two or three ion-qubits with photons. This advancement brings us closer to practical quantum networks that could enable ultra-secure communication and distributed quantum computing.