Type-independent Characterization of Spacelike Separated Resources

TL;DR

This paper introduces a unified framework for characterizing and quantifying the nonclassicality of diverse quantum resources shared between space-like separated parties, simplifying the identification of useful quantum resources.

Contribution

It generalizes existing tools to a single framework applicable to various quantum objects, enabling practical distinction between useful and useless resources.

Findings

Unified framework for quantum resources

Generalized tools for nonclassicality quantification

Applicable to multiple types of quantum objects

Abstract

Quantum theory describes multipartite objects of various types: quantum states, nonlocal boxes, steering assemblages, teleportages, distributed measurements, channels, and so on. Such objects describe, for example, the resources shared in quantum networks. Not all such objects are useful, however. In the context of space-like separated parties, devices which can be simulated using local operations and shared randomness are useless, and it is of paramount importance to be able to practically distinguish useful from useless quantum resources. Accordingly, a body of literature has arisen to provide tools for witnessing and quantifying the nonclassicality of objects of each specific type. In the present work, we provide a framework which subsumes and generalizes all of these resources, as well as the tools for witnessing and quantifying their nonclassicality.