Generalization
The notion of W state has been generalized for qubits and then refers to the quantum superpostion with equal expansion coefficients of all possible pure states in which exactly one of the qubits in an "excited state", while all other ones are in the "ground state"
Both the robustness against particle loss and the LOCC-inequivalence with the (generalized) GHZ state also hold for the -qubit W state.
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