Observations of Bell Inequality Violations with causal isolation between source and detectors

TL;DR

This paper reports an experimental demonstration of Bell Inequality Violations using entangled photons separated by a rotating mirror, confirming quantum nonlocality and ruling out communication-based explanations.

Contribution

First experimental observation of Bell inequality violations with causal isolation between source and detectors using a rotating mirror setup.

Findings

Observed Bell parameter S = 2.30 ± 0.07, exceeding the classical limit of 2.

Causal isolation rules out theories based on traveling communication.

Supports quantum nonlocality and the violation of local realism.

Abstract

We report the experimental observations of Bell Inequality Violations (BIV) in entangled photons causally separated by a rotating mirror. A Foucault mirror gating geometry is used to causally isolate the entangled photon source and detectors. We report an observed BIV of CHSH-$S = 2.30 \pm 0.07 > 2.00$. This result rules out theories that explain correlations with traveling communication between source and detectors.