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Multiparticle entanglement in graph-diagonal states: Necessary and sufficient conditions for four qubits

Multiparticle entanglement in graph-diagonal states: Necessary and sufficient conditions for four qubits

The characterization of genuine multiparticle entanglement is important for entanglement theory as well as experimental studies related to quantum information theory. Here, we completely characterize genuine multiparticle entanglement for four-qubit states diagonal in the cluster-state basis. In addition, we give a complete characterization of multiparticle entanglement for all five-qubit graph …