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Superunsteerability as a quantifiable resource for random access codes assisted by Bell-diagonal states
C JEBARATHINAM, D DAS, S KANJILAL, R SRIKANTH, , , A S MAJUMDAR
Published in American Physical Society
2019
Volume: 100
   
Issue: 1
Abstract
We show how nonclassical correlations in local bipartite states can act as a resource for quantum information processing. Considering the task of quantum random access codes (RACs) through separable Bell-diagonal states, we demonstrate the advantage of superunsteerability over classical protocols assisted with two bits of shared randomness. We propose a measure of superunsteerability which quantifies nonclassicality beyond quantum steering and obtain its analytical expression for Bell-diagonal states in the context of two- and three-setting steering scenarios that are directly related to the quantum 2→1 and 3→1 RAC protocols, respectively. The maximal values of our quantifier yield the optimal quantum efficiency for both of the above protocols, thus showing that superunsteerability provides a precise characterization of the nonclassical resource for implementing RACs with separable Bell-diagonal class of states. © 2019 American Physical Society.
About the journal
JournalData powered by TypesetPhysical Review A
PublisherData powered by TypesetAmerican Physical Society
ISSN2469-9926
Open AccessNo