Entangled multi-qubit states without higher-tangle

Details Entangled multi-qubit states without higher-tangle Entangled multi-qubit states without higher-tangle

2007-07-11

arxiv.org/abs/0707.1578v1

Physics

Quantum Physics

4 pages, 1 figure

Scientific paper

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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