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.
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