Guaranteed emergence of genuine entanglement in 3-qubit evolving systems

  • Andrea Valdés-HernándezEmail author
  • Víctor H. T. Brauer
  • F. Santiago Zamora
Regular Article


Multipartite entanglement has been shown to be of particular relevance for a better understanding and exploitation of the dynamics and flow of entanglement in multiparty systems. This calls for analysis aimed at identifying the appropriate processes that guarantee the emergence of multipartite entanglement in a wide range of scenarios. Here we carry on such analysis considering a system of two initially entangled qubits, one of which is let to interact with a third qubit according to an arbitrary unitary evolution. We establish necessary and sufficient conditions on the corresponding Kraus operators, to discern whether the evolved state pertains to either one of the classes of 3-qubit pure states that exhibit some kind of entanglement, namely biseparable, W-, and GHZ- genuine entangled classes. Our results provide a classification of the Kraus operators according to their capacity of producing 3-qubit entanglement, and pave the way for extending the analysis to larger systems and determining the particular interactions that must be implemented in order to create, enhance and distribute entanglement in a specific manner.

Graphical abstract


Quantum Optics 


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Copyright information

© EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Andrea Valdés-Hernández
    • 1
    Email author
  • Víctor H. T. Brauer
    • 1
  • F. Santiago Zamora
    • 1
  1. 1.Instituto de Física, Universidad Nacional Autónoma de MéxicoCiudad de MéxicoMexico

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