A quantum loophole to Bell nonlocality

TL;DR

This paper challenges Bell's theorem by proposing that individual measurements on entangled pairs are sequences of complete measurements that do not violate locality, suggesting a loophole in the nonlocality argument.

Contribution

It introduces a new measurement framework involving sequential complete measurements that preserve locality, offering a novel perspective on quantum entanglement and Bell nonlocality.

Findings

Quantum measurements can be viewed as sequences of complete measurements.

Such measurements do not violate locality principles.

Bell nonlocality may not apply to typical individual measurements.

Abstract

We argue that the conclusion of Bell theorem, namely, that there must be spatial non-local correlations in certain experimental situations, does not apply to typical individual measurements performed on entangled EPR pairs. Our claim is based on three points, (i) on the notion of quantum {\it complete measurements}; (ii) on Bell results on local yet distant measurements; and (iii) on the fact that perfect simultaneity is banned by the quantum mechanics. We show that quantum mechanics indicates that, while the measurements of the pair members are indeed space-like separated, the pair measurement is actually a sequence of two complete measurements, the first one terminating the entanglement and, therefore, the second one becoming unrelated to the initial preparation of the entangled pair. The outstanding feature of these measurements is that neither of them violates the principle of locality. We discuss that the present measurement viewpoint appears to run contrary to the usual interpretation of "superposition" of states with its concomitant "collapse" on measurement.