Unification of quantum resources in distributed scenarios

TL;DR

This paper extends the coherence resource framework to distributed quantum systems, linking coherence, discord, and entanglement, and demonstrates the operational significance of basis-dependent discord in quantum key distribution.

Contribution

It introduces a unified framework connecting various quantum resources in distributed scenarios, revealing their quantitative relationships and operational meanings.

Findings

Unified measures for quantum resources established

Basis-dependent discord shown to have operational meaning in QKD

Connections between coherence, discord, and entanglement quantitatively formulated

Abstract

Quantum resources, such as coherence, discord, and entanglement, play as a key role for demonstrating advantage in many computation and communication tasks. In order to find the nature behind these resources, tremendous efforts have been made to explore the connections between them. In this work, we extend the single party coherence resource framework to the distributed scenario and relate it to basis-dependent discord. We show the operational meaning of basis-dependent discord in quantum key distribution. By formulating a framework of basis-dependent discord, we connect these quantum resources, coherence, discord, and entanglement, quantitatively, which leads to a unification of measures of different quantum resources.