Revealing Quantum Advantage in a Quantum Network

TL;DR

This paper establishes criteria under which source independence can reveal nonbilocal quantum correlations in networks, using real two-qubit X states to demonstrate the utility of this assumption.

Contribution

It derives sufficient criteria for source independence to reveal nonbilocal correlations in quantum networks, expanding understanding beyond standard Bell scenarios.

Findings

Criteria for source independence to reveal nonbilocality

Application to real two-qubit X states

Enhanced understanding of quantum network correlations

Abstract

The assumption of source independence was used to reveal nonlocal (apart from standard Bell-CHSH scenario) nature of correlations generated in entanglement swapping experiments. In this work, we have derived a set of sufficient criteria, imposed on the states (produced by the sources) under which source independence can reveal nonbilocal nature of correlations in a quantum network. To show this, we have considered real two qubit X states thereby discussing the various utilities of assuming source independence in a quantum network.