Conditional information and hidden correlations in single-qudit states. (arXiv:1704.06082v1 [quant-ph])
We discuss the notions of mutual information and conditional information for
noncomposite systems, classical and quantum; both the mutual information and
the conditional information are associated with the presence of hidden
correlations in the state of a single qudit. We consider analogs of the
entanglement phenomena in the systems without subsystems related to strong
hidden quantum correlations.