In this paper we describe bistochastic Kadison-Schawrz operators on M 2(C). Such description allows us to find positive, but not Kadison-Schwarz operators. Moreover, by means of this characterization we can construct KadisonSchawrz operators which are not completely positive.
ASJC Scopus subject areas
- Statistical and Nonlinear Physics
- Statistics and Probability
- Mathematical Physics