  We discuss the properties of quantum state reactivity as a measure for
quantum correlation. This information geometry-based definition is a
generalization of the two qubit construction of Schumacher to multipartite
quantum states. It requires a generalization of information distance to
information areas as well as to higher-dimensional volumes. The reactivity is
defined in the usual chemistry way as a ratio of surface area to volume. The
reactivity is an average over all detector settings. We show that this measure
posses the key features required for a measure of quantum correlation. We show
that it is invariant under local unitary transformations, non-increasing under
local operations and classical communication, and monotonic. Its maximum bound
can't be obtained using only classical correlation. Furthermore, reactivity is
an analytic function of measurement probabilities and easily extendable to
higher multipartite states.
