Geometric global quantum discord of two-qubit X states

Wen-Chao Qiang, Hua-Ping Zhanga, Lei Zhang

Xu [Jianwei Xu, J. Phys. A: Math. Theor. 45 405304 (2012)] generalized geometric quantum discord [B.Dakic, V. Vedral, and C . Brukner, Phys. Rev. Lett. 105 190502 (2010)] to multip…