Applied Physics B

, Volume 98, Issue 4, pp 617–622 | Cite as

Separability criteria and entanglement witnesses for symmetric quantum states

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Abstract

We study the separability of symmetric bipartite quantum states and show that a single correlation measurement is sufficient to detect the entanglement of any bipartite symmetric state with a non-positive partial transpose. We also discuss entanglement conditions and entanglement witnesses for states with a positive partial transpose.

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Department of Theoretical PhysicsThe University of the Basque CountryBilbaoSpain
  2. 2.IKERBASQUE, Basque Foundation for ScienceBilbaoSpain
  3. 3.Research Institute for Solid State Physics and OpticsHungarian Academy of SciencesBudapestHungary
  4. 4.Institut für Quantenoptik und QuanteninformationÖsterreichische Akademie der WissenschaftenInnsbruckAustria
  5. 5.Institut für Theoretische PhysikUniversität InnsbruckInnsbruckAustria

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