Phys. Rev. A 72, 050101(R) (2005) [4 pages]Loophole-free Bell’s experiments and two-photon all-versus-nothing violations of local realism
We introduce an extended version of a previous all-versus-nothing proof of impossibility of Einstein-Podolsky-Rosen’s local elements of reality for two photons entangled both in polarization and path degrees of freedom (A. Cabello, quant-ph/0507259), which leads to a Bell’s inequality where the classical bound is 8 and the quantum prediction is 16. A simple estimation of the detection efficiency required to close the detection loophole using this extended version gives η>0.69. This efficiency is lower than that required for previous proposals. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.72.050101
DOI:
10.1103/PhysRevA.72.050101
PACS:
03.65.Ud, 03.67.Pp, 03.67.−a, 42.50.−p
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