Abstract
Two previously discovered effects in the intensity interference: a spin-correlation between formerly unpolarized photons and a spin entanglement at-a-distance between photons that nowhere interacted, have been used for a proposal of a new preselection experiment. The experiment puts together two photons from two independent singlets and makes them interfere at an asymmetrical beam splitter. A coincidental detection of two photons emerging from different sides of the beam splitter preselect their pair-companion photons (which nowhere cross each other’s path) into a nonmaximal singlet state. The quantum-mechanical nonlocality thus proves to be essentially a property of selection. This enables a loophole-free experimental disproof of local hidden-variable theories requiring detection efficiency as low as 67% and an exclusion of all nonlocal hidden-variable theories that rely on some kind of a physical entanglement by means of a common medium.
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Pavičić, M. (1997). Preselected Quantum Optical Correlations. In: Jeffers, S., Roy, S., Vigier, JP., Hunter, G. (eds) The Present Status of the Quantum Theory of Light. Fundamental Theories of Physics, vol 80. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5682-0_31
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DOI: https://doi.org/10.1007/978-94-011-5682-0_31
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