Unraveling multipartite entanglement for an important family of mixed states

Schematic of the state space of an N ‐qubit system. The space is subdivided into N separability classes S k , k = 1 (genuinely multipartite entangled), k = 2 (biseparable), ... , k = N (fully separable). Buchholz et al. have exactly obtained the entanglement measure E G ( k )for a specific family of symmetric states. The geometric entanglementE G ( k )( ρ )is the geometric distance of the state ρ from the set of k ‐separable states.