Experimentally Witnessing the Quantumness of Correlations

Details Experimentally Witnessing the Quantumness of Correlations Experimentally Witnessing the Quantumness of Correlations

2011-04-08

arxiv.org/abs/1104.1596v2

Phys. Rev. Lett. 107, 070501 (2011)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevLett.107.070501

The quantification of quantum correlations (other than entanglement) usually entails laboured numerical optimization procedures also demanding quantum state tomographic methods. Thus it is interesting to have a laboratory friendly witness for the nature of correlations. In this Letter we report a direct experimental implementation of such a witness in a room temperature nuclear magnetic resonance system. In our experiment the nature of correlations is revealed by performing only few local magnetization measurements. We also compare the witness results with those for the symmetric quantum discord and we obtained a fairly good agreement.

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