title: Experimentally witnessing the quantumness of correlations.
abstract: The quantification of quantum correlations (other than entanglement) usually entails labored 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 compared the witness results with those for the symmetric quantum discord and we obtained a fairly good agreement.
authors: Empresa Brasileira de Pesquisa Agropecuária, Rio de Janeiro, Brazil.
authors: R
authors: R
authors: Auccaise
authors: J
authors: J
authors: Maziero
authors: L C
authors: LC
authors: Céleri
authors: D O
authors: DO
authors: Soares-Pinto
authors: E R
authors: ER
authors: deAzevedo
authors: T J
authors: TJ
authors: Bonagamba
authors: R S
authors: RS
authors: Sarthour
authors: I S
authors: IS
authors: Oliveira
authors: R M
authors: RM
authors: Serra