Influence of joint measurement bases on sharing network nonlocality

TL;DR

This paper explores how Elegant joint measurement bases affect the sharing of network nonlocality in extended quantum networks, revealing conditions for violation of bilocal inequalities and dependence on entanglement levels.

Contribution

It introduces a detailed analysis of EJM bases in extended bilocal scenarios, demonstrating their impact on sharing network nonlocality and inequality violations.

Findings

All cases of simultaneous violation of the bilocal inequality were captured.

Sharing depends on the amount of entanglement in the joint bases.

Both symmetrical and asymmetrical violations were observed.

Abstract

Sharing network nonlocality in an extended quantum network scenario is the new paradigm in the development of quantum theory. In this paper, we investigate the influence of Elegant joint measurement(in short, EJM) bases in an extended bilocal scenario on sharing network nonlocality via sequential measurement. The work essentially based on the newly introduced[Phys. Rev. Lett. 126, 220401(2021)] bilocal inequality with ternary inputs for end parties and EJM as joint measurement bases in $Alice_n-Bob-Charlie_m$ scenario. Here, we are able to capture all simultaneous violation of this inequality for $(n,m)\in \{(2,1),(1,2),(1,1),(2,2)\}$ cases. We further observe the criteria for sharing network nonlocality where we are able to find also the dependence of the sharing on the amount of entanglement of the joint bases. The effect of the nonlinearity in this inequality is also captured in our results with the symmetrical and asymmetrical violation in this extended scenario. The work will generate further the realization of quantum correlations in network scenario.