Entanglement and non-Markovianity of quantum evolutions

Details Entanglement and non-Markovianity of quantum evolutions Entanglement and non-Markovianity of quantum evolutions

2009-11-22

arxiv.org/abs/0911.4270v2

Phys. Rev. Lett. 105, 050403 (2010)

Physics

Quantum Physics

5 pages, 3 figures, final version

Scientific paper

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.

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