Realization of a multinode quantum network of remote solid-state qubits.

Pompili, M; Hermans, S L N; Baier, S; Beukers, H K C; Humphreys, P C; Schouten, R N; Vermeulen, R F L; Tiggelman, M J; Dos Santos Martins, L; Dirkse, B; Wehner, S; Hanson, R

The distribution of entangled states across the nodes of a future quantum internet will unlock fundamentally new technologies. Here, we report on the realization of a three-node entanglement-based quantum network. We combine remote quantum nodes based on diamond communication qubits into a scalable phase-stabilized architecture, supplemented with a robust memory qubit and local quantum logic. In addition, we achieve real-time communication and feed-forward gate operations across the network. We demonstrate two quantum network protocols without postselection: the distribution of genuine multipartite entangled states across the three nodes and entanglement swapping through an intermediary node. Our work establishes a key platform for exploring, testing, and developing multinode quantum network protocols and a quantum network control stack.