Persistency of non- n -local correlations in noisy linear networks

Abstract

Linear n-local networks are compatible with quantum repeaters based entanglement distribution protocols. Different sources of imperfections such as error in entanglement generation, communication over noisy quantum channels and imperfections in measurements result in decay of quantumness across such networks. From practical perspectives it becomes imperative to analyze non classicality of quantum network correlations in presence of different types of noise. Present discussion provides a formal characterization of non n-local feature of quantum correlations in noisy network scenario. In this context, persistency of non n-locality has been introduced. Such a notion helps in analyzing decay of non n-local feature of network correlations with increasing length of the linear network in presence of one or more causes of imperfections.