Vaccaro, John A.Wiseman, H. M.2004-12-032004-12-0320012001http://hdl.handle.net/2003/181910.17877/DE290R-11564enThe American Physical SocietyPhysical Review Letters530Inequivalence of Pure State Ensembles for Open Quantum Systems: The Preferred Ensembles Are Those That Are Physically Realizable10.1103/PhysRevLett.87.240402article (journal)