A Unified View of Quantum Correlations and Quantum Coherence

TL;DR

This paper presents a unified framework for understanding quantum correlations and coherence, showing that quantum entanglement can be viewed as a form of coherence and linking various quantum correlation measures.

Contribution

It introduces correlated coherence as a unifying concept that encompasses quantum discord and entanglement, providing new insights into quantum correlations.

Findings

Correlated coherence captures quantum correlations like discord and entanglement.

Entanglement can be formulated as an entanglement monotone based on coherence.

The framework unifies different quantum correlation measures under a single perspective.

Abstract

In this paper, we argue that quantum coherence in a bipartite system can be contained either locally or in the correlations between the subsystems. The portion of quantum coherence contained within correlations can be viewed as a kind quantum correlation which we call correlated coherence. We demonstrate that the framework provided by correlated coherence allows us retrieve the same concepts of quantum correlations as defined by the asymmetric and symmetrized versions of quantum discord as well as quantum entanglement, thus providing a unified view of these correlations. We also prove that correlated coherence can be formulated as an entanglement monotone, thus demonstrating that entanglement may be viewed as a specialized form of coherence.