How to construct indecomposable entanglement witnesses
Dariusz Chruściński, Andrzej Kossakowski · Journal of Physics A Mathematical and Theoretical · 2008
We present a very simple method for constructing indecomposable entanglement witnesses out of a given pair—an entanglement witness W and the corresponding state detected by W . This method may be used to produce new classes of atomic witnesses which are able to detect the 'weakest' quantum entanglement. Actually, it works perfectly in the multipartite case, too. Moreover, this method provides a powerful tool for constructing new examples of bound entangled states.