Quantum correlations between separated particles

TL;DR

This paper re-examines long-range quantum correlations in EPR spins, distinguishing between entanglement and disentanglement, and suggests some experiments attributed to entanglement may be better explained by disentanglement, impacting views on quantum non-locality.

Contribution

It provides a new analysis of quantum correlations, differentiating between entanglement and disentanglement, and challenges the conventional interpretation of experiments based on entangled states.

Findings

Bell's inequalities are violated with entanglement.

Disentanglement satisfies Bell's inequalities.

Some experiments may be better explained by disentanglement.

Abstract

Long-range quantum correlations between particles are usually formulated by assuming the persistence of an entangled state after the particles have spearated. Here this approach is re-examined based upon studying the correlations present in a pair of EPR spins. Two types of correltions are identified. The first, due to the quantum interference terms is parity. This symmetry property characterizes entanglement. Second is correlation due to conservation of angular momentum. The two contributions are equal and have the same functional form. When entanglement is present, Bell's inequalities are violated but when parity is destroyed by disentanglement, Bell's inequalities are satisfied. It is shown tht some experiments which have hiterto been interpreted by entangled states can be better described by disentanglement. Implications for quantum non-locality are discussed.