Tighter Constraints of Multiqubit Entanglement

Long-Mei Yang,Bin Chen,Shao-Ming Fei,Zhi-Xi Wang

Fig.1 (Color online) The $y$ axis is the lower bound of the concurrence $\mathcal{C}^\beta_{A|BC}$. The red (green) line represents the lower bound from our result for $k=0.6$ ($k=0.8$), and the blue line represents the lower bound of Eq.(5) from Ref.[22].