Quantum correlations in B and K meson systems
  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. 
Subhashish Banerjee, Ashutosh Kumar Alok, Richard MacKenzie
hep-ph quant-ph