SCIENCE - Quantum physicists shed new light on relation between entanglement and nonlocality

New research from the University of Bristol may disprove a long-standing conjecture made by one of the founders of quantum information science: that quantum states featuring positive partial transpose, a particular symmetry under time-reversal, can never lead to nonlocality

http://www.physorg.com/news/2012-01-quantum-physicists-entanglement-nonlocality.html