Parallel universe theory in quantum mechanics

[Halbhh]

Yes, this is beginning to make some collapse interpretations look less likely, but there's still a long way to go. I suspect diminishing returns in the difficulty of producing and observing massive superpositions will set in well before it casts serious doubt on spontaneous collapse, which has been suggested to occur at around 100 million years per particle.

More on trying to get at what is going on in the 'observer'/reality/collapse question --

https://phys.org/news/2019-11-quantum-physics-reality-doesnt.html

Quantum Bayesianism - Wikipedia

 

[FrumiousBandersnatch]

More on trying to get at what is going on in the 'observer'/reality/collapse question --

https://phys.org/news/2019-11-quantum-physics-reality-doesnt.html

Quantum Bayesianism - Wikipedia

Yes; that first link is really questioning what we mean by 'reality' given QM. I don't see why the various formulations ('interpretations') shouldn't be describing reality - for example, 'Many Worlds' says it is the wavefunction of the universe ¯\_(ツ)_/¯

I don't really 'get' QBism - possibly because I haven't tried very hard; I get the idea that probabilities may be subjective, but I don't see how the epistemic approach works in practice...