Superluminal communication scheme - explanation of what is wrong

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Dated: 22 July 2017

In July 2017, Sofia Wechsler posted the draft of an article entitled "A Schema for Superluminal Communication -- What is Wrong?" Her idea was based on an entanglement between the position and spin degrees of freedom of an atom and a photon. She was sure that something in the scheme for superluminal communication that she had devised herself must be wrong, because she did not believe that nature allows superluminal signal exchange. Finally, she came up with the conclusion that the detection probabilities in her scheme were too small to allow realization of the scheme. My own view is that there must be an explanation that is based on the principles of quantum mechanics, not on the accident, so to speak, of a small or large detection probability (unless we can argue for its smallness again via the principles of quantum mechanics). I attach both Sofia's exposition of the problem and my answer to it that is largely based on considering the density operator that describes the reduced system on the reception end of the system.

A schema for superluminal communication - what is wrong?

Superluminal communication scheme - explanation of what is wrong, 22.07.2017

Next: Hong-Ou-Mandel experiment and Bohm   Up: Introduction science education project    Previous: Limiting behaviour analytic functions, large real argument

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