Quantum discord from system-environment correlations

R. Tatham*, N. Korolkova

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


In an initially uncorrelated mixed separable bi-partite system, quantum correlations can emerge under the action of a local measurement or local noise [1]. We analyse this counter-intuitive phenomenon using quantum discord as a quantifier. We then relate changes in quantum discord to system-environment correlations between the system in a mixed state and some purifying environmental mode using the Koashi-Winter inequality. On this basis, we suggest an interpretation of discord as a byproduct of transferring entanglement and correlations around the different subsystems of a global pure state.

Original languageEnglish
Article number014040
Number of pages3
JournalPhysica Scripta
Publication statusPublished - Apr 2014


  • discord
  • entanglement
  • non-classical
  • correlations
  • tripartite Gaussian states


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