Entanglement measures

  • Authors:
  • Michał Horodecki

  • Affiliations:
  • Institute of Theoretical Physics and Astrophysics, University of Gdańsk, Poland

  • Venue:
  • Quantum Information & Computation
  • Year:
  • 2001

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Abstract

Theory of quantifying entanglement is reviewed in a unified framework. The subject is divided with respect to finite and asymptotic regime, as well as abstract and operational approach. Important measures are presented within four classes according to different methods of construction. The relations between postulates for asymptotic and finite regime are clarified. Many results are formulated based on general properties of the involved functions and classes of states and operations, without referring to entanglement anymore. It is argued that while in finite regime only monotonicity is relevant postulate, for asymptotic regime, one needs, in general, monotonicity, a kind of extensivity and continuity.