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 language | English |
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Article number | 012344 |
Journal | Physical Review A |
Volume | 100 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2019 Jul 25 |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics