2014/12/31 by D. Cavalcanti, Daniel Cavalcanti, P. Skrzypczyk +6 · 1 citation
Computer Science · Mathematics · Physics and Astronomy · #Computer science #Mathematics #Multipartite #Multipartite entanglement #Open quantum system #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum cryptography #Quantum entanglement #Quantum information #Quantum mechanics #Quantum network #Quantum technology #Squashed entanglement #Theoretical computer science #Topology (electrical circuits) #W state #quant-ph
paper · pdf · doi:10.1038/ncomms8941
published as Nat. Commun. 6, 7941 (2015) · 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
openalex publication_date 2015/08/03 · arxiv created 2016/02/14 · arxiv updated 2016/02/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.