Analytical expressions of global quantum discord for two classes of multi-qubit states

作者：Xu Jianwei^*

来源：Physics Letters A, 2013, 377(3-4): 238-242.

DOI：10.1016/j.physleta.2012.11.054

• Global quantum discord
• Multi-qubit state
• Sudden transition

Global quantum discord (GQD), proposed by Rulli and Sarandy [CC. Rulli, M.S. Sarandy, Phys. Rev. A 84 (2011) 042109], is a generalization of quantum discord to multipartite states. In this Letter, 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.

• 出版日期2013-1-3
• 单位北京计算科学研究中心; 四川大学