Broadcast copies reveal the quantumness of correlations

M. Piani, M. Christandl, C. E. Mora, P. Horodecki

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)


We study the quantumness of bipartite correlations by proposing a quantity that combines a measure of total correlations-mutual information-with the notion of broadcast copies-i.e., generally nonfactorized copies-of bipartite states. By analyzing how our quantity increases with the number of broadcast copies, we are able to classify classical, separable, and entangled states. This motivates the definition of the broadcast regularization of mutual information, the asymptotic minimal mutual information per broadcast copy, which we show to have many properties of an entanglement measure.
Original languageEnglish
Article number250503
Number of pages4
JournalPhysical Review Letters
Issue number25
Publication statusPublished - 26 Jun 2009


  • quantumness
  • bipartite correlations
  • broadcast copies
  • broadcast regularization of mutual information
  • entanglement measure


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