Geodesic
Characterization of Bistochastic Kadison--Schwarz Operators on $M_2(\mathbb C)$
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Mathematics of Quantum Technologies, Tome 313 (2021), pp. 178-191.

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We characterize bistochastic Kadison–Schwarz operators acting on $M_2(\mathbb C)$. The obtained characterization allows us to find positive operators that are not Kadison–Schwarz ones. Moreover, we provide several examples of Kadison–Schwarz operators which are not completely positive.
Keywords: bistochastic mapping, Kadison–Schwarz operator, complete positivity. 
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Farrukh Mukhamedov; Hasan Akın. Characterization of Bistochastic Kadison--Schwarz Operators on $M_2(\mathbb C)$. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Mathematics of Quantum Technologies, Tome 313 (2021), pp. 178-191. http://geodesic.mathdoc.fr/item/TM_2021_313_a15/

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