not_Fritz_Argelander

Experiment suggests reality isn't objective

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by , 03-13-2019 at 03:39 AM (519 Views)
Quote Originally Posted by not_Fritz_Argelander View Post
I think that the original MIT Technology Review article deserves a posted link so that one can get closer to the horse's mouth, this is an important issue.

https://www.technologyreview.com/s/6...ctive-reality/

In other words, the experiment suggests that one or more of the assumptions—the idea that there is a reality we can agree on, the idea that we have freedom of choice, or the idea of locality—must be wrong.
And then there is the horse's mouth itself.....

https://arxiv.org/abs/1902.05080

The scientific method relies on facts, established through repeated measurements and agreed upon universally, independently of who observed them. In quantum mechanics, the objectivity of observations is not so clear, most dramatically exposed in Eugene Wigner's eponymous thought experiment where two observers can experience fundamentally different realities. While observer-independence has long remained inaccessible to empirical investigation, recent no-go-theorems construct an extended Wigner's friend scenario with four entangled observers that allows us to put it to the test. In a state-of-the-art 6-photon experiment, we here realise this extended Wigner's friend scenario, experimentally violating the associated Bell-type inequality by 5 standard deviations. This result lends considerable strength to interpretations of quantum theory already set in an observer-dependent framework and demands for revision of those which are not.
I'd rather give up freedom of choice and/or locality, though.
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