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Entanglement Theory Quantum Correlations

Quantum discord: a measure of the quantumness of correlations.

PubMed
Authors: Ollivier H, Zurek WH

Year

2002

Paper ID

13145

Status

Peer-reviewed

Abstract Read

~2 min

Abstract Words

92

Citations

3,647

Abstract

Two classically identical expressions for the mutual information generally differ when the systems involved are quantum. This difference defines the quantum discord. It can be used as a measure of the quantumness of correlations. Separability of the density matrix describing a pair of systems does not guarantee vanishing of the discord, thus showing that absence of entanglement does not imply classicality. We relate this to the quantum superposition principle, and consider the vanishing of discord as a criterion for the preferred effectively classical states of a system, i.e., the pointer states.

Why This Paper Matters

  • This paper contributes to the Entanglement Theory & Quantum Correlations research area in the Quantum Articles archive.
  • It adds a 2002 reference point for readers tracking recent quantum research.
  • Two classically identical expressions for the mutual information generally differ when the systems involved are quantum.

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References & Citation Signals

[1] DOI https://doi.org/10.1103/PhysRevLett.88.017901 [2] Publisher https://pubmed.ncbi.nlm.nih.gov/11800986/

Local Citation Graph (Related-Paper Links)

Current Paper #13145 #69032 Beyond the Canonical Protocol: ... #69027 Computational Superiority of No... #69013 Quantum correlations and cohere... #68993 Tomography of quantum states wi...

External citation index: OpenAlex citation signal • updated 2026-06-13 23:28:52

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