Global Quantum discord of multi-qubit states
arXiv:1204.5868 · doi:10.1016/j.physleta.2012.11.054
Abstract
Global quantum discord (GQD), proposed by Rulli and Sarandy [Phys. Rev. A \textbf{84}, 042109 (2011)], is a generalization of quantum discord to multipartite states. In this paper, we provide an equivalent expression for GQD, and obtain the analytical expressions of GQD for two classes of multi-qubit states. The phenomena of sudden transition and freeze of GQD are also discussed.
6 pages, 1 figure. Comments are welcome
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