Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 2: Quanteninformation: Konzepte und Methoden 1

Q 2.2: Talk

Monday, March 12, 2012, 10:45–11:00, V7.03

Behavior of Quantum Correlations under Local Noise — •Alexander Streltsov, Hermann Kampermann, and Dagmar Bruß — Heinrich-Heine-Universität Düsseldorf, Institut für Theoretische Physik III, D-40225 Düsseldorf, Germany

We characterize the behavior of quantum correlations under the influence of local noisy channels. Intuition suggests that such noise should be detrimental for quantumness. When considering qubit systems, we show for which channels this is indeed the case: The amount of quantum correlations can only decrease under the action of unital channels. However, nonunital channels (e.g., such as dissipation) can create quantum correlations for some initially classical states. Furthermore, for higher-dimensional systems even unital channels may increase the amount of quantum correlations. Thus, counterintuitively, local decoherence can generate quantum correlations.