Experimental multipartite entanglement and randomness certification of   the W state in the quantum steering scenario
  Recently [Cavalcanti \textit{et al.} Nat Commun \textbf{6}, 7941 (2015)] proposed a method to certify the presence of entanglement in asymmetric networks, where some users do not have control over the measurements they are performing. Such asymmetry naturally emerges in realistic situtations, such as in cryptographic protocols over quantum networks. Here we implement such "semi-device independent" techniques to experimentally witness all types of entanglement on a three-qubit photonic W state. Furthermore we analise the amount of genuine randomness that can be certified in this scenario from any bipartition of the three-qubit W state. 
A. M\'attar, P. Skrzypczyk, G. H. Aguilar, R. V. Nery, P. H. Souto   Ribeiro, S. P. Walborn, D. Cavalcanti
quant-ph