Lately, I've tried to use Google in an attempt to understand the concepts of wave function collapse and quantum decoherence. So far though, things sound a bit contradictory. If the the actual existence of collapse is uncertain and the proponents of decoherence admit they haven't resolved the measurement problem, what then...if anything is on the horizon?
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Your initial discoveries are correct, and already show a better understanding of this than you see in most presentations. That is, existence of collapse is uncertain, and decoherence does not on its own solve the problem.
The literature is huge and most of it is, I am sorry to say, of little value, so beware!
A paper worth the read is the one by Frauchiger and Renner, Nature Communications 2018. https://doi.org/10.1038/s41467-018-05739-8 But even with this one you should beware. The title of the paper is a bit over-stated I would say. It is not so hard to give a consistent description of the thought-experiment they describe, but at least they do give a survey of some approaches, and a reasonable list of references. The weakness of their paper is that they are a bit loose with terminology such as "rational agent" I would say.
Andrew Steane
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