Identical, independent quantum weak measurements violate objective realism

TL;DR

This paper shows that using two identical, independent weak measurements on quantum computers can demonstrate a violation of objective realism, with high statistical significance, confirming quantum non-classicality and hardware quality.

Contribution

It introduces a novel approach using unconstrained weak measurements with independent detectors to test objective realism on quantum computers.

Findings

Violation observed at 10 standard deviations

High-quality parametric two-qubit gates confirmed

Demonstration on IBM and IonQ quantum computers

Abstract

We demonstrate violation of objective realism in quantum world using unconstrained weak measurements. Instead of limited Leggett-Garg approach with artificial bounds on the observed values, we assume two identical and indepenent weak detectors and final conditioning. The experimental verification has been performed on public quantum computers, IBM and IonQ. Thanks to sufficiently large statistics, the violation is observed at the level of 10 standard deviations. The tests confirmed also high quality of parametric two-qubit gates offered by main quantum hardware providers.