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In quantum information W states are a central class of multipartite entangledstates because of their robustness against noise and use in many quantumprocesses. Their generation however remains a demanding task whose difficultyincreases with the number of particles. We report a simple scalable conceptualscheme where a single particle in an ancilla mode works as entanglementcatalyst of W state for other $N$ separated identical particles. A crucialnovel aspect of the scheme, which exploits basically spatialindistinguishability, is its universality, being applicable without essentialchanges to both bosons and fermions. Our proposal represents a new paradigmwithin experimental preparation of many-particle entanglement based on quantumindistinguishability.

$N$ identical particles and one particle to entangle them all