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## Main Question or Discussion Point

I've been reading up on HMI, and the claims its proponents make are pretty impressive. I'm struggling to understand some details though, so I'm hoping someone here is more familiar with it.

In http://www.vub.ac.be/CLEA/aerts/publications/1998Berlin.pdf, the authors describe a "macroscopic quantum machine", which for a single particle state does an impressive job of replicating QM. I can't quite see how the machine can be extended to multiparticle states though.. They mention extending this to an EPR-type experiment but they don't go into any details on exactly how two independent measurement devices would be represented macroscopically.

It seems to me like there would necessarily be a serious non-locality to any version of this theory, since the random measurement processes need to be correlated with each other, even though they can have an arbitrarily large space-like separation. Introducing

In http://www.vub.ac.be/CLEA/aerts/publications/1998Berlin.pdf, the authors describe a "macroscopic quantum machine", which for a single particle state does an impressive job of replicating QM. I can't quite see how the machine can be extended to multiparticle states though.. They mention extending this to an EPR-type experiment but they don't go into any details on exactly how two independent measurement devices would be represented macroscopically.

It seems to me like there would necessarily be a serious non-locality to any version of this theory, since the random measurement processes need to be correlated with each other, even though they can have an arbitrarily large space-like separation. Introducing

*real*non-locality requires some limiting mechanism so that locality will be restored in larger systems, and I can't find any attempt to address this in HMI