Generating quantum nonlocal entanglement with mechanical rotations

Recent experiments have searched for evidence of the impact of noninertial motion on the entanglement of particles. The success of these endeavors 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 noninertial 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 signaling strong quantum nonlocality. Furthermore, we show that inequality remains violated even without using any form of postselection up to the value <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mn>1</a:mn><a:mo>+</a:mo><a:msqrt><a:mn>2</a:mn></a:msqrt></a:mrow></a:math>. Our results demonstrate that mechanical rotation can be thought of as resource for controlling quantum nonlocality with implications also for recent proposals for experiments that can probe the quantum nature of curved spacetimes and noninertial motion.