All non-classical correlations can be activated into distillable entanglement

TL;DR

This paper introduces a protocol demonstrating that all non-classical correlations in quantum systems can be converted into distillable entanglement, highlighting the operational significance of the relative entropy of quantumness.

Contribution

It establishes an operational interpretation of the relative entropy of quantumness as the minimal distillable entanglement generated, linking non-classical correlations to entanglement creation.

Findings

Non-classical correlations can be activated into entanglement.

The relative entropy of quantumness measures the minimum distillable entanglement.

Mixed states can exhibit greater non-classicality than pure states.

Abstract

We devise a protocol in which general non-classical multipartite correlations produce a physically relevant effect, leading to the creation of bipartite entanglement. In particular, we show that the relative entropy of quantumness, which measures all non-classical correlations among subsystems of a quantum system, is equivalent to and can be operationally interpreted as the minimum distillable entanglement generated between the system and local ancillae in our protocol. We emphasize the key role of state mixedness in maximizing non-classicality: Mixed entangled states can be arbitrarily more non-classical than separable and pure entangled states.