Correlations In n-local Scenario

Abstract

Recently Bell-type inequalities were introduced in Phys. Rev. A \textbf{85}, 032119 (2012) to analyze the correlations emerging in an entanglement swapping scenario characterized by independence of the two sources shared between three parties. The corresponding scenario was referred to as \textit{bilocal} scenario. Here, we derive Bell-type inequalities in $n+1$ party scenario, i.e., in $n$-local scenario. Considering the two different cases with several number of inputs and outputs, we derive local and $n$-local bounds. The $n$-local inequality studied for two cases are proved to be tight. Replacing the sources by maximally entangled states for two binary inputs and two binary outputs and also for the fixed input and four outputs, we observe quantum violations of $n$-local bounds. But the resistance offered to noise cannot be increased as compared to the bilocal scenario. Thus increasing the number of parties in a linear fashion in source independent scenario does not contribute in lowering down the requirements of revealing quantumness in a network in contrast to the star configuration (Phys. Rev. A \textbf{90}, 062109 (2014)) of $n+1$ parties.

13 pages, 4 figures, revtex, comments welcome, to appear in qip

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• Nontrilocality: Exploiting nonlocality from three particle systems
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• Persistency of non-n-local correlations in noisy linear networks
• Revealing Quantum Advantage in a Quantum Network
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• Detecting Nontrilocal Correlations In Triangle Networks
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• Post-quantum nonlocality in the minimal triangle scenario
• $(n,m,p)$-type quantum network configuration and its nonlocality
• Causal Networks and Freedom of Choice in Bell's Theorem
• Guarantees on the structure of experimental quantum networks
• Conditional steering under von-Neumann scenario
• Nonlocality in Continuous-Variable Quantum Networks