  There are two important paradigms for defining quantum correlations in
quantum information theory, viz. the information-theoretic and the
entanglement-separability ones. We find an analytical relation between two
measures of quantum correlations, one in each paradigm, and show that only a
certain cone-like region on the two-dimensional space spanned by these measures
is accessible to pure three-qubit states. The information-theoretic multiparty
quantum correlation measure is related to the monogamy considerations of a
bipartite information-theoretic quantum correlation measure, while the
entanglement-separability multiparty measure is the generalized geometric
measure, a genuine multiparty entanglement measure. We also find an analytical
relation between two multiparty entanglement measures, and again obtain a
cone-like accessible region in this case. One of the multisite measures in this
case is related to the monogamy of a bipartite entanglement measure, while the
other is again the generalized geometric measure. Just like in relativity,
events cannot occur outside the space-time light cone, we analogously find here
that state points corresponding to pure three-qubit states cannot fall outside
the two-dimensional cone-like structure between quantum monogamy scores and a
genuine multisite entanglement measure.
