Abstract
We shall present an elementary approach to extremal decompositions of (quantum) covariance matrices determined by densities. We give a new proof on former results and provide a sharp estimate of the ranks of the densities that appear in the decomposition theorem.
Citation
Zoltán Léka. "A note on extremal decompositions of covariances." Rocky Mountain J. Math. 46 (2) 571 - 580, 2016. https://doi.org/10.1216/RMJ-2016-46-2-571
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