Generating quantum non-local entanglement with mechanical rotations

TL;DR

This paper proposes a Sagnac-like interferometer that uses mechanical rotation to generate and detect quantum non-local entanglement, demonstrating violations of Bell inequalities up to the Tsirelson bound, with implications for quantum gravity experiments.

Contribution

It introduces a novel interferometer setup that leverages mechanical rotation to produce and observe quantum entanglement over large scales, surpassing previous limitations.

Findings

States violate Bell-CHSH inequality up to Tsirelson bound

Violations persist without post-selection up to 1+√2

Mechanical rotation acts as a resource for quantum non-locality

Abstract

Recent experiments have searched for evidence of the impact of non-inertial motion on the entanglement of particles. The success of these endeavours has been hindered by the fact that such tests were performed within spatial scales that were only "local" when compared to the spatial scales over which the non-inertial motion was taking place. We propose a Sagnac-like interferometer that, by challenging such bottlenecks, is able to achieve entangled states through a mechanism induced by the mechanical rotation of a photonic interferometer. The resulting states violate the Bell-Clauser-Horne-Shimony-Holt (Bell-CHSH) inequality all the way up to the Tsirelson bound, thus signalling strong quantum nonlocality. Furthermore, we show that the Bell-CHSH inequality remains violated even without using any form of post-selection up to the value $1+\sqrt{2}$. Our results demonstrate that mechanical rotation can be thought of as resource for controlling quantum non-locality with implications also for recent proposals for experiments that can probe the quantum nature of curved spacetimes and non-inertial motion.