Experimental demonstration of the violations of Mermin's and Svetlichny's inequalities for W- and GHZ-class of states

TL;DR

This paper experimentally demonstrates violations of Mermin's and Svetlichny's inequalities for W- and GHZ-class states using IBM's five-qubit superconducting quantum computer, confirming nonlocal correlations in multipartite quantum systems.

Contribution

First experimental demonstration of these inequalities' violations for W- and GHZ-class states on a superconducting quantum platform.

Findings

Violations confirmed for both W- and GHZ-class states.

Used IBM's five-qubit quantum computer for implementation.

Platform enables exploration of multipartite inequalities.

Abstract

Violation of Mermin's and Svetlichny's inequalities can rule out the predictions of local hidden variable theory and can confirm the existence of true nonlocal correlation for n-particle pure quantum systems. Here we demonstrate the experimental violation of the above inequalities for W- and GHZ-class of states. We use IBM's five-qubit quantum computer for experimental implementation of these states and illustration of inequalities' violations. Our results clearly show the violations of both Mermin's and Svetlichny's inequalities for W and GHZ states respectively. Being a superconducting qubit-based quantum computer, the platform used here opens up the opportunity to explore multipartite inequalities which is beyond the reach of other existing technologies.