  The interplay between the various measures of quantum correlations are well
known in stable optical and electronic systems. Here, for the first time, we
study such foundational issues in unstable quantum systems. Specifically we
study meson-antimeson systems, which are produced copiously in meson factories.
We use the semigroup formalism to compute the time evolution of several
measures of quantum correlations for three meson systems (K-Kbar, Bd-Bdbar and
Bs-Bsbar), circumventing difficulties which arise using other methods due to
the instability of these particles. We then compare these measures to one
another and find that the relations between them can be nontrivially different
from those of their stable counterparts such as neutrinos.
