par Massar, Serge ;Popescu, Sandu
Référence Asymptotic Theory of Quantum Statistical Inference: Selected Papers, World Scientific Publishing Co., page (386-392)
Publication Publié, 2005-01
Partie d'ouvrage collectif
Résumé : Given only a finite ensemble of identically prepared particles, how precisely can one determine their states? We describe optimal measurement procedures in the case of spin-1/2 particles. Furthermore, we prove that optimal measurement procedures must necessarily view the ensemble as a single composite system rather than as the sum of its components, i.e., optimal measurements cannot be realized by separate measurements on each particle.