M. Stobińska, F. Töppel, P. Sekatski, A. Buraczewski, N. Gisin
The ultimate confirmation of the quantum theory by a loophole-free Bell inequality test is still missing. We examine the possibility of a loophole-free CHSH-Bell inequality test with unsymmetrical singlet states of light by employing preselection procedure which is performed prior to the test. We show an example of preselection scheme which allows to improve violation of this inequality with the micro-macro polarization singlet produced by the optimal quantum cloning. The preselection is realized by a POVM which is believed not to be useful for this purpose. The test is based on linear optical elements and is feasible within the current technology.
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http://arxiv.org/abs/1304.7460
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