Quantum discord and non-Markovianity of quantum dynamics

Details Quantum discord and non-Markovianity of quantum dynamics Quantum discord and non-Markovianity of quantum dynamics

2012-03-11

arxiv.org/abs/1203.2347v2

Physics

Quantum Physics

5 pages, 3 figures

Scientific paper

The problem of recognizing (non-)Markovianity of a quantum dynamics is revisited through analyzing quan- tum correlations. We argue that instantaneously-vanishing quantum discord provides a necessary and sufficient condition for Markovianity of a quantum map. This is used to introduce a measure of non-Markovianity. This measure, however, requires demanding knowledge about the system and the environment. By using a quantum correlation monogamy property and an ancillary system, we propose a simplified measure with less require- ments. Non-Markovianity is thereby decided by quantum state tomography of the system and the ancilla.

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