On description of bistochastic Kadison-Schwarz operators on M₂(C)
classification
🧮 math-ph
math.FAmath.MPquant-ph
keywords
operatorsbistochasticdescriptionkadison-schawrzkadison-schwarzpositiveallowscharacterization
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In this paper we describe bistochastic Kadison-Schawrz operators on $M_2(\mathbb{C})$. Such a description allows us to find positive, but not Kadison-Schwarz operators. Moreover, by means of that characterization we construct Kadison-Schawrz operators, which are not completely positive.
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