Experimental test of Mermin inequalities on a 5-qubit quantum computer

TL;DR

This study experimentally tests Mermin inequalities on a 5-qubit IBM quantum computer, demonstrating violations for 3 to 5 qubits and exploring multipartite entanglement beyond other technologies.

Contribution

First experimental violation of Mermin inequalities on a 5-qubit superconducting quantum computer, showcasing multipartite entanglement capabilities.

Findings

Violations observed for 3, 4, and 5 qubits

Results degrade with increasing qubits

Demonstrates multipartite entanglement beyond other tech

Abstract

Violation of Mermin inequalities is tested on the 5-qubit IBM quantum computer. For 3, 4 and 5 parties, quantum states that violate the corresponding Mermin inequalities are constructed using quantum circuits on superconducting qubits. Measurements on different basis are included as additional final gates in the circuits. The experimental results obtained using the quantum computer show violation of all Mermin inequalitites, with a clear degradation of the results in the 5 qubit case. Though this quantum computer is not competitive to test Mermin inequalities as compared to other techniques when applied to few qubits, it does offer the opportunity to explore multipartite entanglement for four and five qubits beyond the reach of other alternative technologies.