Randomness-based macroscopic Franson-type nonlocal correlation

TL;DR

This paper introduces a macroscopic form of Franson-type nonlocal correlation using laser light, expanding the scope of Bell inequality tests beyond microscopic photon pairs through polarization superposition and probabilistic randomness.

Contribution

It presents a novel macroscopic Franson-type correlation scheme based on polarization superposition, extending nonlocal correlation tests to macroscopic regimes.

Findings

Demonstrates macroscopic nonlocal correlation using laser light

Extends Franson correlation beyond microscopic photon pairs

Highlights role of probabilistic randomness in nonlocality

Abstract

Franson-type nonlocal correlation is a testing tool for Bell inequality violation using noninterfering interferometers, where coincidence measurements involve an interference fringe of g^((1)) correlation between noninterfering photon pairs. Like the Bell inequality, Franson correlation is also limited to a microscopic regime of entangled photon pairs. Here, randomness-based macroscopic Franson-type nonlocal correlation is presented using polarization-basis coherent superposition of laser light, where probabilistic randomness between bipartite orthonormal bases plays an important role for both Bell inequality and the g^((1)) correlation. Without contradiction to the conventional understanding of quantumness limited by the particle nature of photons, the proposed Franson correlation can also be extended to a general scheme of macroscopic regimes via coherent superposition.