Operational interpretations of quantum discord
Quantum Physics
2011-04-04 v5
Abstract
Quantum discord quantifies non-classical correlations going beyond the standard classification of quantum states into entangled and unentangled ones. Although it has received considerable attention, it still lacks any precise interpretation in terms of some protocol in which quantum features are relevant. Here we give quantum discord its first operational meaning in terms of entanglement consumption in an extended quantum state merging protocol. We further relate the asymmetry of quantum discord with the performance imbalance in quantum state merging and dense coding.
Cite
@article{arxiv.1008.3205,
title = {Operational interpretations of quantum discord},
author = {D. Cavalcanti and L. Aolita and S. Boixo and K. Modi and M. Piani and A. Winter},
journal= {arXiv preprint arXiv:1008.3205},
year = {2011}
}
Comments
v4: 5 pages, 1 fig. Refs added, text improved. Main results unchanged. See arXiv:1008.4135v2 for a related work. v5: close to the published version