Nonlocal correlations in the star-network configuration
2014 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 90, no 6, 062109- p.Article in journal (Refereed) Published
The concept of bilocality was introduced to study the correlations which arise in an entanglement-swapping scenario, where one has two sources which can naturally be taken to be independent. This additional constraint leads to stricter requirements than simply imposing locality, in the form of bilocality inequalities. In this work we consider a natural generalization of the bilocality scenario; namely, the star network consisting of a single central party surrounded by n edge parties, each of which shares an independent source with the center. We derive inequalities which are satisfied by all local correlations in this scenario, for the cases when the central party performs (i) two dichotomic measurements (ii) a single Bell-state measurement. We demonstrate quantum violations of these inequalities and study both the robustness to noise and to losses.
Place, publisher, year, edition, pages
2014. Vol. 90, no 6, 062109- p.
IdentifiersURN: urn:nbn:se:su:diva-112900DOI: 10.1103/PhysRevA.90.062109ISI: 000346369800001OAI: oai:DiVA.org:su-112900DiVA: diva2:782970