Towards loophole-free Bell inequality test with preselected unsymmetrical singlet states of light
arXiv:1304.7460 · doi:10.1103/PhysRevA.89.022119
Abstract
Can a Bell test with no detection loophole be demonstrated for multi-photon entangled states of light within the current technology? We examine the possibility of a postselection-free CHSH-Bell inequality test wih an unsymmetrical polarization singlet. To that end we employ a preselection procedure which is performed prior to the test. It allows using imperfect (coarse-grained) binary photodetection in the test. We show an example of preselection scheme which improves violation of the CHSH inequality with the micro-macro polarization singlet produced by the optimal quantum cloning. The preselection is realized by a quantum filter which is believed to be not useful for this purpose.
arXiv comment12 pages, 8 figures, accepted to Phys. Rev. A
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