Wheeler’s thought experiment is a variant of an experiment using two static slits, in which one of the slits may be closed after a photon passes through both slits, but before the photon has reached the screen. Practically, this applies a delayed choice to the structure of the system with which a photon interacts. How does a particle “know” that one of the slits was closed? How fast is the “knowing” communication?

I think that the result of Wheeler's delayed choice experiment is a natural consequence of the entanglement of moving photons and particles (atoms, molecules) of the slit through which they move. The inclusion of quantum fields (taking into account that speed of virtual particles is not limited) self-consistently explains why interaction’s propagation velocity after closing one slit is larger than the speed of light.

See also Melkikh A.V. Quantum entanglement, Wheeler’s delayed choice experiment and its explanation on the basis of quantization of fields. Journal of Physics Conference Series. 880 (2017) 012030.

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