Hyperentangled states are fascinating resources in quantum information processing as they can significantly increase the channel capacity and enhance noise resistance. We explore a hyperfusion mechanism to fuse one $n$-photon hyper-$W$ state and one $m$-photon hyper-$W$ state into a large-scale $(n+m-2)$-photon hyper-$W$ state. Another mechanism to fuse one $n$-photon hyper-$W$ state, one $m$-photon hyper-$W$ state, and one $t$-photon hyper-$W$ state into an $(n+m+t-3)$-photon hyper-$W$ state is also proposed. These two hyperfusion mechanisms are constructed employing only polarizing beam splitters, balanced beam splitters, half-wave plates, single-photon detectors, and cross-Kerr nonlinearities. Conditional quantum gates, path couplers, and ancillary photons are not required in our constructions. Moreover, our fused $W$ states are hyperentangled in the polarization and spatial degrees of freedom of single-photon systems. The presence of only one garbage output state demonstrates that high efficiency can be achieved in our schemes.

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• Entanglement manipulation
• Entanglement production
• Hyperentanglement
• Optical quantum information processing
• Photonics
• Quantum communication
• Quantum state engineering
• Quantum states of light