Quantum instrumentality uniquely singles out the non-local advantage of quantum coherence

Abstract

Recently, it was shown that quantum steerability is stronger than the bound set by the instrumental causal network. This implies that quantum instrumentality cannot simulate Einstein-Podolsky-Rosen (EPR) -nonlocal correlations completely. Here we show that quantum instrumentality uniquely and completely singles out the nonlocal advantage of quantum coherence, unlike EPR correlation.