Citation: Rivas , A , Huelga , S F & Plenio , M B 2010 , ' Entanglement and Non-Markovianity of Quantum Evolutions ' Physical Review Letters , vol 105 , no. 5 , 050403 . DOI: 10.1103/PhysRevLett.105.050403
We address the problem of quantifying the non-Markovian character of quantum time evolutions of general systems in contact with an environment. We introduce two different measures of non-Markovianity that exploit the specific traits of quantum correlations and are suitable for opposite experimental contexts. When complete tomographic knowledge about the evolution is available, our measure provides a necessary and sufficient condition to quantify strictly the non-Markovianity. In the opposite case, when no information whatsoever is available, we propose a sufficient condition for non-Markovianity. Remarkably, no optimization procedure underlies our derivation, which greatly enhances the practical relevance of the proposed criteria.
Original article can be found at: http://prl.aps.org/ Copyright American Physical Society [Full text of this article is not available in the UHRA]