Superunsteerability as a quantifiable resource for random access codes assisted by Bell-diagonal states

C. Jebarathinam, Debarshi Das, Som Kanjilal, R. Srikanth, Debasis Sarkar, Indrani Chattopadhyay, A. S. Majumdar

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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.

Original languageEnglish
Article number012344
JournalPhysical Review A
Volume100
Issue number1
DOIs
Publication statusPublished - 2019 Jul 25

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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