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      A quantitative witness for Greenberger-Horne-Zeilinger entanglement 

      Eltschka, Christopher; Siewert, Jens ORCID (Nature Publishing Group, 2012-12)
      Along with the vast progress in experimental quantum technologies there is an increasing demand for the quantification of entanglement between three or more quantum systems. Theory still does not provide adequate tools for ...
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      The shape of higher-dimensional state space: Bloch-ball analog for a qutrit 

      Eltschka, Christopher; Huber, Marcus; Morelli, Simon; Siewert, Jens ORCID (Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften, 2021-06-29)
      [EN] Geometric intuition is a crucial tool to obtain deeper insight into many concepts of physics. A paradigmatic example of its power is the Bloch ball, the geometrical representation for the state space of the simplest ...