%0 Journal Article %T On measures of non-Markovianity: divisibility vs. backflow of information %A Dariusz Chru£¿ci¨½ski %A Andrzej Kossakowski %A ¨¢ngel Rivas %J Physics %D 2011 %I arXiv %R 10.1103/PhysRevA.83.052128 %X We analyze two recently proposed measures of non-Markovianity: one based on the concept of divisibility of the dynamical map and the other one based on distinguishability of quantum states. We provide a toy model to show that these two measures need not agree. In addition, we discuss possible generalizations and intricate relations between these measures. %U http://arxiv.org/abs/1102.4318v2