Construction of entanglement witnesses based on concurrence for multi-qubit states
We establish a relation between concurrence and entanglement witnesses. In particular, we construct entanglement witnesses for three-qubit W and GHZ states in terms of concurrence. We also generalize our construction for multi-qubit states. This result gives the finest entanglement witnesses for a given class of state without any optimization.
entanglement entanglement witnesses concurrence multipartite states