No nonlocal advantage of quantum coherence beyond quantum instrumentality

TL;DR

This paper demonstrates that quantum instrumentality can fully simulate EPR correlations when considering nonlocal advantage of quantum coherence, challenging previous notions of its limitations.

Contribution

It shows that quantum instrumentality can simulate EPR correlations completely in the context of NAQC, providing a new perspective on quantum correlations and causal models.

Findings

Quantum instrumentality can simulate EPR correlations fully in NAQC context.

The entire set of EPR correlations can be explained by the LHS model within the instrumental causal framework.

Challenges previous results suggesting nonlocal advantage of quantum coherence is limited.

Abstract

Recently, it was shown that quantum steerability is stronger than the bound set by the instrumental causal network. This implies, quantum instrumentality cannot simulate EPR-nonlocal correlations completely. In contrast, here we show that quantum instrumentality can indeed simulate EPR correlations completely and uniquely if viewed from the perspective of NAQC. Implication of our result is that the entire set of EPR-correlations can be explained by the LHS model in the instrumental causal background if viewed from the perspective of NAQC.