Efficient generation of large-scale multipartite entangled states is a critical but challenging task in quantum information processing. Although generation of multipartite entanglement within a small set of individual qubits has been demonstrated, further scale-up in system size requires the connection of smaller entangled states into a larger state in a scalable and modular manner. Here, we achieve this goal by implementing memory-enhanced fusion of two multipartite entangled states via photonic interconnects. Through asynchronous preparation of two tripartite $W$-state entanglements in two spatially separated modules of atomic quantum memories and on-demand fusion via single-photon interference, we demonstrate the creation of a four-partite $W$-state entanglement shared by two remote quantum memory modules in a heralded way. We also demonstrate memory-enhanced scaling in efficiencies in the entanglement fusion. The demonstrated scalable generation and fusion of multipartite entangled states pave the way toward realization of large-scale distributed quantum information processing in the future.

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• Entanglement production
• Quantum communication, protocols & technology
• Quantum engineering
• Quantum entanglement
• Quantum information processing
• Quantum memories
• Quantum networks