Loophole-free Bell's experiment and two-photon all-versus-nothing violation of local realism

Details Loophole-free Bell's experiment and two-photon all-versus-nothing violation of local realism Loophole-free Bell's experiment and two-photon all-versus-nothing violation of local realism

2005-07-27

arxiv.org/abs/quant-ph/0507260v4

Phys. Rev. A 72 (2005) 050101(R)

Physics

Quantum Physics

REVTeX4, 4 pages

Scientific paper

10.1103/PhysRevA.72.050101

We introduce an 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, 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 proof gives eta > 0.69. This efficiency is lower than that required for previous proposals.

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