Behavior of Quantum Correlations under Local Noise

Details Behavior of Quantum Correlations under Local Noise Behavior of Quantum Correlations under Local Noise

2011-06-10

arxiv.org/abs/1106.2028v1

Phys. Rev. Lett. 107, 170502 (2011)

Physics

Quantum Physics

5 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.107.170502

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 channel this is indeed the case: the amount of quantum correlations can only decrease under the action of unital channels. However, non-unital channels (e.g. such as dissipation) can create quantum correlations for some initially classical state. Furthermore, for higher-dimensional systems even unital channels may increase the amount of quantum correlations. Thus, counterintuitively, local decoherence can generate quantum correlations.

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