Revisiting the experimental test of Mermin's inequalities at IBMQ

TL;DR

This paper demonstrates the violation of Mermin's inequalities on IBM's five-qubit quantum computers, providing evidence against local realism and proposing a circuit-based method to evaluate quantum computer reliability.

Contribution

It presents the first experimental violation of Mermin's inequalities on IBMQ, improving previous results and introducing a circuit implementation for assessing quantum computer reliability.

Findings

Violation of Mermin's inequalities observed on IBMQ

Significant improvement over previous experimental results

Proposed circuit implementation as a reliability assessment tool

Abstract

Bell-type inequalities allow for experimental testing of local hidden variable theories. In the present work we show the violation of Mermin's inequalities in IBM's five-qubit quantum computers, ruling out the local realism hypothesis in quantum mechanics. Furthermore, our numerical results show significant improvement with respect to previous implementations. The circuit implementation of these inequalities is also proposed as a way of assessing the reliability of different quantum computers.