Extremal marginal tracial states in coupled systems

Details Extremal marginal tracial states in coupled systems Extremal marginal tracial states in coupled systems

2006-07-06

arxiv.org/abs/math/0607175v1

Mathematics

Operator Algebras

12 pages

Scientific paper

Let \Gamma be the convex set consisting of all marginal tracial states on the tensor product B \otimes B of the algebra B of nxn matrices over the complex numbers. We find necessary and sufficient conditions for such a state to be extremal in \Gamma. We also give a characterization of those extreme points in \Gamma which are pure states. We conjecture that all extremal marginal tracial states are pure states.

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