All-versus-nothing violation of local realism for two entangled photons.
It is shown that the Greenberger-Horne-Zeilinger theorem can be generalized to the case with only two entangled particles. The reasoning makes use of two photons which are maximally entangled both in polarization and in spatial degrees of freedom. In contrast to Cabello's argument of "all versus nothing" nonlocality with four photons [Phys. Rev. Lett. 87, 010403 (2001)]], our proposal to test the theorem can be implemented with linear optics and thus is well within the reach of current experimental technology.
Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230027, China.
Zeng-Bing
ZB
Chen
Jian-Wei
JW
Pan
Yong-De
YD
Zhang
Caslav
C
Brukner
Anton
A
Zeilinger