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2007

Entangled multi-qubit states without higher-tangle

Fan, Heng, Ou, Yong-Cheng, Roychowdhury, Vwani

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We analyze mixed multi-qubit states composed of a W class state and a product state with all qubit in |0>.

We find the optimal pure state decomposition and convex roofs for higher-tangle with bipartite partition between one qubit and the rest qubits for those mixed states.
The optimality of the decomposition is ensured by the Coffman-Kundu-Wootters (CKW) inequality which describes the monogamy of quantum entanglement.
The generalized monogamy inequality is found to be true for W class states with arbitrary partitions between one qubit and multi-qubit.

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