Experimental multipartite entanglement and randomness certification of the W state in the quantum steering scenario
Abstract
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.
Keywords
Cite
@article{arxiv.1609.00226,
title = {Experimental multipartite entanglement and randomness certification of the W state in the quantum steering scenario},
author = {A. Máttar and P. Skrzypczyk and G. H. Aguilar and R. V. Nery and P. H. Souto Ribeiro and S. P. Walborn and D. Cavalcanti},
journal= {arXiv preprint arXiv:1609.00226},
year = {2017}
}
Comments
v2: text improved, steering witness redefined so that their violation provides the steering robustness, experimental data included in an appendix