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Semigroup of positive maps for qu-dit states and entanglement in tomographic probability representationMARMO, GIUSEPPE and SIMONI, ALBERTO and VENTRIGLIA, FRANCO (2008) Semigroup of positive maps for qu-dit states and entanglement in tomographic probability representation. [Pubblicazione su rivista scientifica] Full text non disponibile da questo archivio. AbstractStochastic and bistochastic matrices providing positive maps for spin states (for qudits) are shown to form semigroups with dense intersection with the Lie groups $IGL(n, \mathbb{R})$ and $GL(n, \mathbb{R})$ respectively. The density matrix of a qudit sta
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