Entanglement Loophole Closed - Science News: ...experimental physicists have been working on ruling out nonquantum explanations — in other words, closing the “loopholes” in quantum theory...
The freedom-of-choice loophole argues that maybe the widely separated photons in an experiment aren’t communicating, but the machines used to generate them and measure their polarizations are. Such a conspiracy (a sensor sending a “gimme a vertical photon” message to the source or vice versa) could influence the outcome of the experiment and make it appear that there is a quantum link...
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