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Interpreting quantum discord through quantum state merging
, Datta A.
Published in American Physical Society
Volume: 83
Issue: 3
We present an operational interpretation of quantum discord based on the quantum state merging protocol. Quantum discord is the markup in the cost of quantum communication in the process of quantum state merging, if one discards relevant prior information. Our interpretation has an intuitive explanation based on the strong subadditivity of von Neumann entropy. We use our result to provide operational interpretations of other quantities like the local purity and quantum deficit. Finally, we discuss in brief some instances where our interpretation is valid in the single-copy scenario. © 2011 American Physical Society.
About the journal
JournalData powered by TypesetPhysical Review A - Atomic, Molecular, and Optical Physics
PublisherData powered by TypesetAmerican Physical Society
Open AccessNo