Robustness of Entanglement as a Resource

TL;DR

This paper proposes a method to evaluate the robustness of multipartite entanglement by analyzing its impact on quantum communication tasks like information splitting and teleportation, providing a practical assessment tool.

Contribution

It introduces a task-based approach to measure entanglement robustness, overcoming ambiguities from traditional measures and system partitioning.

Findings

Entanglement robustness correlates with performance in communication tasks.

Task-based measures provide clearer assessment than traditional entanglement measures.

The approach offers a practical way to evaluate entanglement in noisy quantum systems.

Abstract

The robustness of multipartite entanglement of systems undergoing decoherence is of central importance to the area of quantum information. Its characterization depends however on the measure used to quantify entanglement and on how one partitions the system. Here we show that the unambiguous assessment of the robustness of multipartite entanglement is obtained by considering the loss of functionality in terms of two communication tasks, namely the splitting of information between many parties and the teleportation of states.