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The relation between tangle and local unitary invariants for pure three and four-qubit states (1404.4912v1)
Published 19 Apr 2014 in quant-ph
Abstract: A new form of local unitary (LU) transformation invariant is given for multi-qubit states . The general relation between tangle and the LU transformation invariant of pure three and four-qubit states is given. We find that the tangle actually is a special LU transformation invariant. Furthermore, the tangle is a important local unitary (LU) transformation invariant which is a nessesary condition for maximally multi-qubit entangled state.