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Phys. Rev. A 72, 050101 (2005) [4 pages]

Loophole-free Bell’s experiments and two-photon all-versus-nothing violations of local realism

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Adán Cabello *
Departamento de Física Aplicada II, Universidad de Sevilla, 41012 Sevilla, Spain

Rapid Communication Received 27 July 2005; revised 4 October 2005; published 17 November 2005

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

* Electronic address: adan@us.es

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