Explicit construction of Local Hidden Variables for any quantum theory up to any desired accuracy

TL;DR

This paper demonstrates that any quantum model can be approximated by a classical system to arbitrary accuracy, challenging the applicability of Bell's theorem and offering new insights into quantum realism.

Contribution

It provides an explicit method to construct classical hidden variable models that replicate quantum predictions to any desired precision.

Findings

Classical models can mimic quantum systems arbitrarily closely.

Bell's theorem does not apply under the constructed models.

Initial states in quantum experiments can be realistic in these models.

Abstract

The machinery of quantum mechanics is fully capable of describing a single realistic world. Here we discuss the converse: in spite of appearances, and indeed numerous claims to the contrary, any quantum mechanical model can be mimicked, up to any finite accuracy, by a completely classical system of equations. An implication of this observation is that Bell's theorem is not applicable in the cases considered. This is explained by scrutinising Bell's assumptions concerning causality, retrocausality, statistical (in-)dependence, and his fear of `conspiracy' (there is no conspiracy in the language used to describe the deterministic models). The most crucial mechanism for the counter intuitive Bell/CHSH violation is the fact that, regardless the settings chosen by Alice and Bob, the initial state of the system should be a realistic one. The potential importance of our construction in model building is discussed.