Coarse-graining and the Blackwell order

Johannes Rauh, Pradeep Kr. Banerjee, Eckehard Olbrich +3

Suppose we have a pair of information channels, ${\kappa }_1,{\kappa }_2$, with a common input. The Blackwell order is a partial order over channels that compares ${\kappa }_1$ and ${\kappa }_2$ by the ma…