Spectral conditions for entanglement witnesses versus bound entanglement
Dariusz Chruściński, Andrzej Kossakowski, Gniewomir Sarbicki · Physical Review A · 2009
It is shown that entanglement witnesses constructed via the family of spectral conditions are decomposable, i.e., cannot be used to detect bound entanglement. It supports several observations that bound entanglement reveals highly nonspectral features.