A locally deterministic, detector-based model of quantum measurement

TL;DR

This paper introduces a causally deterministic, detector-based model of quantum measurement that reproduces quantum phenomena like entanglement and Bell violations using classical-like threshold detection schemes.

Contribution

It presents a novel, simple model that reproduces quantum measurement outcomes and phenomena without relying on intrinsic quantum indeterminism.

Findings

Model reproduces Born rule probabilities

Exhibits entanglement and Bell inequality violations

Shows quantum phenomena can have classical analogs

Abstract

This paper describes a simple, causally deterministic model of quantum measurement based on an amplitude threshold detection scheme. Surprisingly, it is found to reproduce many phenomena normally thought to be uniquely quantum in nature. To model an $N$-dimensional pure state, the model uses $N$ complex random variables given by a scaled version of the wave vector with additive complex noise. Measurements are defined by threshold crossings of the individual components, conditioned on single-component threshold crossings. The resulting detection probabilities match or approximate those predicted by quantum mechanics according to the Born rule. Nevertheless, quantum phenomena such as entanglement, contextuality, and violations of Bell's inequality under local measurements are all shown to be exhibited by the model, thereby demonstrating that such phenomena are not without classical analogs.