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Journal Article

Towards loophole-free Bell inequality test with preselected unsymmetrical singlet states of light

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Stobinska,  Magdalena
Optics Theory Group, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Toeppel,  Falk
Optics Theory Group, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Stobinska, M., Toeppel, F., Sekatski, P., & Buraczewski, A. (2014). Towards loophole-free Bell inequality test with preselected unsymmetrical singlet states of light. PHYSICAL REVIEW A, 89(2): 022119. doi:10.1103/PhysRevA.89.022119.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-663D-D
Abstract
Can a Bell test with no detection loophole be demonstrated for multiphoton entangled states of light within the current technology? We examine the possibility of a postselection-free Clauser-Horne-Shimony-Holt (CHSH)-Bell inequality test with 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 a 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 not to be useful for this purpose.