From: *Bruno Marchal* <marc...@ulb.ac.be <mailto:marc...@ulb.ac.be>>
On 11 Apr 2018, at 14:19, Bruce Kellett <bhkell...@optusnet.com.au <mailto:bhkell...@optusnet.com.au>> wrote:

From: *Bruno Marchal* <marc...@ulb.ac.be <mailto:marc...@ulb.ac.be>>

If you believe in influence at a distance, you are the one needing to show the evidence of that extra-ordinary fact.

The fact is demonstrated by the experiments that test Bell inequalities on the singlet state.

Not at all. This proves the existence of influence at a distance when we suppose that a measurement gives an outcome, but in QM without collapse, a measurement gives all outcomes, with varying relative probabilities.

The measurement on one of the spin-half particles in the singlet state has only two possible outcomes. As is often said in discussions of non-locality in Everettian QM, 'measurements that are not made do not have outcomes!'

You did not. You have even considered a singlet state like if it involves 4 parallel universes, when it involves infinitely many. See more in the archive.

The singlet state involves only four possible combinations of experimental results

We have discussed this, and I have never agree with this. The singlet state (in classical non GR QM) describes at all times an infinity of combinations of experimental result.

This is false. Even in Everettian QM there are only two possible outcomes for each spin measurement: this leads to two distinct worlds for each particle of the pair. Hence only 4 possible parallel universes. Where do you get the idea that there are infinitely many parallel universes? This is not part of Everettian QM, or any other model of QM. But even if you can manufacture an infinity of universes, you still have not shown how this removes the non-locality inherent in the quantum formalism.

Bruce

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