Tetrapartite entanglement measures of W-class in noninertial frames

Torres-Arenas Ariadna J¹, López-Zúñiga Edgar O^{1, 2}, Antonio Saldaña-Herrera J^{1, 2}, Dong Qian¹, Sun Guo-Hua³, Dong Shi-Hai^{1, †}

(a) Residual entanglement (π-tangle) for Alice and Bob as well as their comparison with their 1–3 tangle. (b) Residual entanglement (π-tangle) for Charlie and David.