This is a ψ-epistemic interpretation. It considers all systems as quantum
mechanical. In that setting all systems can be needle states or observers.
This will then mean a system of observers are on different paths or
amplitudes and do not share the same outcome. This is somewhat related to
Qbism, where different observers may have different Bayesian regressions or
a sequence of measurements. This has some interesting prospects for quantum
complexity, where a state |A〉 = H_1H_2...H_n|B〉 for a sequence of Hadamard
gates. This defines the complexity C(A,B) as a path or geodesic. The Wigner
friend issue means there can be an ambiguity over which path is extremizes
the complexity.
This has a weak effect on the macroscopic world. As Heisenberg pointed out
there is no sharp boundary between the quantum and classical domains. There
is no matter how much we might object some quantum uncertain fuzz around
classical reality. This means we could find some irreducible errors in
needle states for qubit systems that approach the mesoscopic domain. These
irreducible errors may reflects some tiny level of this epistemic
uncertainty between observer's account of reality.
LC
On Saturday, September 26, 2020 at 10:23:44 PM UTC-5 Bruce wrote:
> This is a video of a short talk Carlo Rovelli gave on the Relational
> Interpretation of Quantum Mechanics (RQM)
>
> https://www.youtube.com/watch?v=syb3WfSGRoE
>
>
> A more detailed account is given in this paper from a Royal Society
> meeting:
>
> arXiv:1712.02894v5
>
>
> Rovelli's RQM is an interesting alternative perspective -- similar to
> QBism, but without the extreme instrumentalism of that approach. I think
> that RQM contains some interesting insights, in particular, the
> rejection of "object realism" about the Schrodinger wave function.
> Following Dirac and Heisenberg, Rovelli thinks that the Schrodinger
> equation is an essentially misleading attempt to render the discreteness
> of the quantum in terms of a continuous wave. At best, the wave
> function is simply a book-keeping device, keeping records of past
> interactions.
>
> I go along with much of this -- it is certainly better than QBism in
> that it retains a viable form of realism -- but Rovelli comes seriously
> unstuck when he attempts to give a fully local account of the EPR
> correlations...
>
> arXiv:quant-ph/0604064v3
>
> Bruce
>
>
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