Detection of entanglement in asymmetric quantum networks and multipartite quantum steering
Abstract
The future of quantum communication relies on quantum networks composed by observers sharing multipartite quantum states. The certification of multipartite entanglement will be crucial to the usefulness of these networks. In many real situations it is natural to assume that some observers are more trusted than others in the sense that they have more knowledge of their measurement apparatuses. Here we propose a general method to certify all kinds of multipartite entanglement in this asymmetric scenario and experimentally demonstrate it in an optical experiment. Our results, which can be seen as a definition of genuine multipartite quantum steering, give a method to detect entanglement in a scenario in between the standard entanglement and fully device-independent scenarios, and provide a basis for semi-device-independent cryptographic applications in quantum networks.
Keywords
Cite
@article{arxiv.1412.7730,
title = {Detection of entanglement in asymmetric quantum networks and multipartite quantum steering},
author = {D. Cavalcanti and P. Skrzypczyk and G. H. Aguilar and R. V. Nery and P. H. Souto Ribeiro and S. P. Walborn},
journal= {arXiv preprint arXiv:1412.7730},
year = {2016}
}
Comments
12 pages, 2 figures. v3: added the supplementary information as an appendix as it contains all the technical details and relevant results such as multipartite steering inequalities and a generalisation of the NPA hierarchy for steering