TL;DR
This paper introduces an equivalent expression for global quantum discord, derives analytical formulas for specific multi-qubit states, and discusses phenomena like sudden transition and freezing of GQD.
Contribution
It provides a new equivalent form of GQD and analytical solutions for certain multi-qubit states, advancing understanding of quantum correlations.
Findings
Derived an equivalent expression for GQD.
Obtained analytical formulas for two classes of multi-qubit states.
Discussed phenomena of sudden transition and freeze of GQD.
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.
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