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A basic role of entanglement witnesses in detection of entanglement is emphasized. ... They also discuss a basic role of entanglement in quantum communication within distant labs paradigm and stress some peculiarities such as irreversibility of entanglement manipulations including its extremal ... ACKNOWLEDGMENTS We thank Jadwiga Horodecka for help in the editing of this paper. ...doi:10.1103/revmodphys.81.865 fatcat:6ahjbb4iyzfn5jgsocbeodmsqm