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Local description of quantum inseparability Sanpera Trigueros, Anna Tarrach, R., 1948- Vidal Bonafont, Guifré Mecànica quàntica Quantum mechanics We show how to decompose any density matrix of the simplest binary composite systems, whether separable or not, in terms of only product vectors. We determine for all cases the minimal number of product vectors needed for such a decomposition. Separable states correspond to mixing from one to four pure product states. Inseparable states can be described as pseudomixtures of four or five pure product states, and can be made separable by mixing them with one or two pure product states. 2009-10-06T09:25:12Z 2009-10-06T09:25:12Z 1998 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1050-2947 https://hdl.handle.net/2445/9552 146066 eng Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevA.58.826 Physical Review A, 1998, vol. 58, núm. 2, p. 826-830. http://dx.doi.org/10.1103/PhysRevA.58.826 (c) The American Physical Society, 1998 info:eu-repo/semantics/openAccess 5 p. application/pdf application/pdf The American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)