Acín dal Maschio, AntonioLatorre, José IgnacioPascual, Pedro, 1934-20062009-10-062009-10-0620001050-2947https://hdl.handle.net/2445/9558Positive-operator-valued measurements on a finite number of N identically prepared systems of arbitrary spin J are discussed. Pure states are characterized in terms of Bloch-like vectors restricted by a SU(2J+1) covariant constraint. This representation allows for a simple description of the equations to be fulfilled by optimal measurements. We explicitly find the minimal positive-operator-valued measurement for the N=2 case, a rigorous bound for N=3, and set up the analysis for arbitrary N.7 p.application/pdfeng(c) The American Physical Society, 2000Mecànica quànticaTeoria de la informacióQuantum mechanicsQuantum informationinfo:eu-repo/semantics/article173170info:eu-repo/semantics/openAccess