Spontaneous emission and quantum discord: comparison of Hilbert-Schmidt and trace distance discord
arXiv:1408.0647 · doi:10.1016/j.physleta.2014.09.055
Abstract
Hilbert - Schmidt and trace norm geometric quantum discord are compared with regard to their behavior during local time evolution. We consider the system of independent two - level atoms with time evolution given by the dissipative process of spontaneous emission. It is explicitly shown that the Hilbert - Schmidt norm discord has nonphysical properties with respect to such local evolution and cannot serve as a reasonable measure of quantum correlations and the better choice is to use trace norm discord as such a measure.