  Local noise can produce quantum correlations on an initially classically
correlated state, provided that it is not represented by a unital or
semi-classical channel \cite{DagmarBruss}. We find the power of any given local
channel for producing quantum correlations on an initially classically
correlated state. We introduce a computable measure for quantifying the quantum
correlations in quantum-classical states, which is based on the
non-commutativity of ensemble states in one party of the composite system.
Using this measure we show that the amount of quantum correlations produced, is
proportional to the classical correlations in the initial state. The power of
an arbitrary channel for producing quantum correlations is found by averaging
over all possible initial states. Finally we compare our measure with the
geometrical measure of quantumness for a subclass of quantum-classical sates,
for which we have been able to find a closed analytical expression.
