Nonlocal signaling in the configuration space model of quantum-classical interactions

TL;DR

This paper reveals that the Hall-Reginatto model of quantum-classical interactions exhibits nonlocal signaling when interactions are off, challenging its applicability outside scenarios with constant interactions like gravity.

Contribution

It identifies a nonlocal signaling issue in the Hall-Reginatto model, highlighting a fundamental limitation in its current formulation.

Findings

Nonlocal signaling occurs when interactions are off

The model is only applicable when interactions are always on

Limitations restrict the model to specific scenarios like gravity

Abstract

When interactions are turned off, the theory of interacting quantum and classical ensembles due to Hall and Reginatto is shown to suffer from a nonlocal signaling effect that is effectively action at a distance. This limits the possible applicability of the theory. In its present form, it is restricted to those situations in which interactions are always on, such as classical gravity interacting with quantized matter.