A Decomposition Theorem for Positive Maps, and the Projection Onto a Spin Factor

• Autores: Erling Stormer
• Localización: Mathematica scandinavica, ISSN 0025-5521, Vol. 118, Nº 1, 2016, págs. 106-118
• Idioma: inglés
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• Resumen

  • It is shown that each positive map between matrix algebras is the sum of a maximal decomposable map and an atomic map which is both optimal and co-optimal. The result is studied in detail for the projection onto a spin factor.