paper

Quantum discord and non-Markovianity of quantum dynamics

arXiv:1203.2347 · doi:10.1103/PhysRevA.85.052108

Abstract

The problem of recognizing (non-)Markovianity of a quantum dynamics is revisited through analyzing quantum 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 requirements. Non-Markovianity is thereby decided by quantum state tomography of the system and the ancilla.

5 pages, 3 figures

References in corpus (13)

Quantum discord and non-Markovianity of quantum dynamics · wovepaper