Nov 14, 2019

A preprint of the paper is available on arXiv [1].

[1] https://arxiv.org/abs/1902.05080

Aug 22, 2019

> Wave collapse feels like nonsense, requires arbitrary notions of "observers".

There's recently been a long thread over on PhysicsForums[1] about the Wiegner's friend experiment[2]. The thread was kicked off by this[3] paper detailing a realization of the experiment, in which the authors conclude "this result lends considerable strength to interpretations of quantum theory already set in an observer-dependent framework and demands for revision of those which are not."

Then again as far as I can see MWI doesn't come out victorious, "one way to accommodate our result is by proclaiming that “facts of the world” can only be established by a privileged observer—e.g., one that would have access to the “global wavefunction” in the many worlds interpretation".

Then again I haven't studied QM so what do I know. Fun to think about while on the bus tho!

[1]: https://www.physicsforums.com/threads/a-realization-of-a-bas...

[2]: https://en.wikipedia.org/wiki/Wigner%27s_friend

[3]: https://arxiv.org/abs/1902.05080