  Broadcasting quantum and classical information is a basic task in quantum
information processing, and is also a useful model in the study of quantum
correlations including quantum discord. We establish a full operational
characterization of two-sided quantum discord in terms of bilocal broadcasting
of quantum correlations. Moreover, we show that both the optimal fidelity of
unilocal broadcasting of the correlations in an arbitrary bipartite quantum
state and that of broadcasting an arbitrary set of quantum states can be
formulized as semidefinite programs (SDPs), which are efficiently computable.
We also analyze some properties of these SDPs and evaluate the broadcasting
fidelities for some cases of interest.
