Characterizing quantumness via entanglement creation

Sevag Gharibian, Marco Piani, Gerardo Adesso, John Calsamiglia, Pawe Horodecki

Research output: Contribution to journalArticleResearchpeer-review

20 Citations (Scopus)


In [Piani et al., PRL 106 (2011) 220403], an activation protocol was introduced which maps the general non-classical (multipartite) correlations between given systems into bipartite entanglement between the systems and local ancillae by means of a potentially highly entangling interaction. Here, we study how this activation protocol can be used to entangle the starting systems themselves via entanglement swapping through a measurement on the ancillae. Furthermore, we bound the relative entropy of quantumness (a naturally arising measure of non-classicality in the scheme of Piani et al. above) for a special class of separable states, the so-called classicalquantum states. In particular, we fully characterize the classicalquantum two-qubit states that are maximally non-classical. © 2011 World Scientific Publishing Company.
Original languageEnglish
Pages (from-to)1701-1713
JournalInternational Journal of Quantum Information
Publication statusPublished - 1 Oct 2011


  • Non-classical correlations
  • entanglement generation
  • quantumness


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