Peculiarities of quantum discord’s geometric measure
Josep Amengual i Batle, Angel Ricardo Plastino, Angel Ricardo Plastino, Matías Emiliano Casas · Journal of Physics A Mathematical and Theoretical · 2011
Some properties of the quantum discord based on the geometric measure advanced by Dakic et al (2010 Phys. Rev. Lett. 105 190502 ) are discussed here by recourse to a systematic survey of the two-qubit state-space, with emphasis on Werner and MEM states. We explore the dependence of quantum discord on the degree of mixedness of the bipartite states, and also its connection with non-locality as measured by the maximum violation of a Bell inequality within the CHSH scenario. Some considerations regarding the XY model are also made.