[ExI] Is quantum mechanics is deterministic or stochastic?

Giulio Prisco giulio at gmail.com
Wed Nov 17 17:15:19 UTC 2021

On 2021. Nov 17., Wed at 17:07, BillK via extropy-chat <
extropy-chat at lists.extropy.org> wrote:

> In Giulio's current discussion, John Clark claimed "the quantum wave
> function is completely deterministic but, because we can only observe
> a very small part of it, things seem random to us, so we must resort
> to probability in our predictions."
> -------------
> This claim is much disputed by quantum theorists. Every experiment has
> supported the randomness of quantum mechanics. While emotionally
> appealing (e.g. Einstein), the search for support of 'hidden-variables
> theory' has so far failed.

Schrödinger knew that, von Neumann knew that… But many scientists had and
continue to have an emotional resistance to non-determinism.

> Bell's theorem would appear to prove many hidden-variable theories to
> be impossible.
> See: <https://en.wikipedia.org/wiki/Hidden-variable_theory>
> <https://en.wikipedia.org/wiki/Interpretations_of_quantum_mechanics>
> Ethan Siegel has a recent article on this very subject.
> <https://bigthink.com/starts-with-a-bang/quantum-spookiness/>
> Quotes:
> How the best alternative to “quantum spookiness” failed
> Many still cling to the idea that we live in a deterministic Universe,
> despite the nature of quantum physics. Now, the "least spooky"
> interpretation no longer works.
> The idea that two quanta could be instantaneously entangled with one
> another, even across large distances, is often talked about as the
> spookiest part of quantum physics. If reality were fundamentally
> deterministic and were governed by hidden variables, this spookiness
> could be removed. Unfortunately, attempts to do away with this type of
> quantum weirdness have all failed.
> Until the discovery of radioactivity and quantum physics, every
> particle and interaction was thought to obey completely deterministic
> equations. Quantum mechanics can only yield an indeterminate
> probability distribution of outcomes. It cannot tell you what comes
> next. The leading deterministic interpretation, involving hidden
> variables, is called Bohmian mechanics. Its only distinct prediction
> was just falsified.
> -----------------
> Fascinating article!
> BillK
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