Nonlocality for two particles without inequalities for almost all entangled states

Phys. Rev. Lett. 71, 1665 – Published 13 September 1993
Lucien Hardy


It is shown that it is possible to demonstrate nonlocality for two particles without using inequalities for all entangled states except maximally entangled states such as the singlet state. The eigenvectors corresponding to the measurements that must be performed to do this are exhibited and found to have a particularly simple relationship to the entangled state.


  • Received 21 April 1993
  • Published in the issue dated 13 September 1993

© 1993 The American Physical Society

Authors & Affiliations

Lucien Hardy

  • Department of Mathematical Physics, St. Patrick’s College, Maynooth, Co. Kildare, Ireland

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