Ri Qu, Zong-shang Li, Juan Wang, Yan-ru Bao
Several entanglement measures are used to define equivalence classes in the set of hypergraph states of three qubits. Our classifications reveal that (i) under local unitary transformations, hypergraph states of three qubits are split into six classes and only one class of them is not equivalent to any graph state; (ii) under stochastic local operations with classical communication, for the single copy case hypergraph states of three qubits, partitioned into five classes which can not be converted into a W state, are equivalent to graph states; and (iii) when bipartite entanglement in three qubits considered, hypergraph states of three qubits are split into five classes and only one class of them has the same entangled graph as the W state.
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http://arxiv.org/abs/1301.3576
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