Conditional mutual information and self-commutator
  A simpler approach to the characterization of vanishing conditional mutual information is presented. Some remarks are given as well. More specifically, relating the conditional mutual information to a commutator is a very promising approach towards the approximate version of SSA. That is, it is conjectured that small conditional mutual information implies small perturbation of quantum Markov chain. 
Lin Zhang
quant-ph math-ph math.FA math.MP math.OA