The resource theory of nonclassicality of channel assemblages

TL;DR

This paper develops a resource theory framework to analyze nonclassical correlations in generalized EPR scenarios involving channel assemblages, providing tools to quantify and convert such resources.

Contribution

It introduces a unified resource theory for nonclassicality of channel assemblages, including semidefinite programming methods for resource conversion analysis.

Findings

Derived a semidefinite program for EPR resource pre-ordering

Identified possible conversions between nonclassical resources

Analyzed post-quantum resource conversions both analytically and numerically

Abstract

When two parties, Alice and Bob, share correlated quantum systems and Alice performs local measurements, Alice's updated description of Bob's state can provide evidence of nonclassical correlations. This simple scenario, famously introduced by Einstein, Podolsky and Rosen (EPR), can be modified by allowing Bob to also have a classical or quantum system as an input. In this case, Alice updates her knowledge of the channel (rather than of a state) in Bob's lab. In this paper, we provide a unified framework for studying the nonclassicality of various such generalizations of the EPR scenario. We do so using a resource theory wherein the free operations are local operations and shared randomness (LOSR). We derive a semidefinite program for studying the pre-order of EPR resources and discover possible conversions between the latter. Moreover, we study conversions between post-quantum resources both analytically and numerically.