A lower bound of quantum conditional mutual information
  In this paper, a lower bound of quantum conditional mutual information is obtained by employing the Peierls-Bogoliubov inequality and Golden Thompson inequality. Comparison with the bounds obtained by other researchers indicates that our result is independent of any measurements. It may give some new insights over squashed entanglement and perturbations of Markov chain states. 
Lin Zhang and Junde Wu
quant-ph math-ph math.MP math.OA