Improved lower bounds on genuine-multipartite-entanglement concurrence
  Genuine-multipartite-entanglement (GME) concurrence is a measure of genuine multipartite entanglement that generalizes the well-known notion of concurrence. We define an observable for GME concurrence. The observable permits us to avoid full state tomography and leads to different analytic lower bounds. By means of explicit examples we show that entanglement criteria based on the bounds have a better performance with respect to the known methods. 
Zhi-Hua Chen, Zhi-Hao Ma, Jing-Ling Chen, Simone Severini
quant-ph