Strengthened Bell inequalities for orthogonal spin directions

Jos Uffink, Michael Seevinck

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We provide bounds on correlations of locally orthogonal observables in two-qubit separable states. These bounds strengthen the Bell inequality and improve upon some alternative entanglement criteria. They provide necessary and sufficient criteria for separability of pure states and test the correlations allowed by local hidden variable models against those allowed by separable quantum states.

Original languageEnglish (US)
Pages (from-to)1205-1212
Number of pages8
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Issue number8
StatePublished - Feb 18 2008
Externally publishedYes

Bibliographical note

Copyright 2020 Elsevier B.V., All rights reserved.


  • Bell inequality
  • Entanglement detection
  • Local realism
  • Orthogonal observables
  • Separability


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