Sabine Hossenfelder
Physicist and science communicator. Writes Backreaction and makes videos explaining new physics and astronomy results, frequently to argue that the headline about them overstates the case.
Sabine Hossenfelder did not write this page.
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Their wordsThe Copenhagen Model-and because of that, the Copenhagen Interpretation-is not locally causal in Bell's sense.
↗Quantum Confusions, Cleared Up (or so I hope)arxiv.org All 4 from this paper
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Their wordsSince Local Causality is a property of a model, observing violations of Bell's inequality cannot tell us anything about nature itself, but merely about the properties of the model that we use to describe nature.
↗Quantum Confusions, Cleared Up (or so I hope)arxiv.org All 4 from this paper
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Their wordswhile decoherence has the potential to solve this aspect of the measurement problem, it hasn't yet been satisfactorily done. Decoherence also certainly does not return us to Local Causality.
↗Quantum Confusions, Cleared Up (or so I hope)arxiv.org All 4 from this paper
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Our reading
The collapse postulate cannot simply be discarded without replacement instructions for measurements.
Their wordsAs we just saw, one cannot just discard the Collapse Postulate. For this reason, if one does calculations in any Many Worlds approach, one must effectively replace the Collapse Postulate by other assumptions, notably about what happens to observers and/or measurement devices when worlds branch.
↗Quantum Confusions, Cleared Up (or so I hope)arxiv.org All 4 from this paper