On 11/22/2019 9:35 PM, Bruce Kellett wrote:
On Sat, Nov 23, 2019 at 7:02 AM 'Brent Meeker' via Everything List
<[email protected]
<mailto:[email protected]>> wrote:
On 11/22/2019 6:14 AM, John Clark wrote:
Why does the act of measurement seem to override the evolution of
Schrödinger's wave function, and what exactly does a
"measurement" even mean? Many Worlds is the only interpretation
that can give a credible answer to that question
The epistemological interpretation also gives a credible answer.
Have you ever seen the paper by Pusey, Barrett, and Rudolph
(arXiv:1111.3328)? They prove a theorem that places limitations on
the viability of a purely epistemic interpretation of the wave
function: "Here we show that any model in which a quantum state
represents mere information about an underlying physical state of the
system, and in which systems prepared independently have independent
physical states, must make predictions which contradict those of
quantum theory."
Which continues:
"The argument depends on few assumptions. One is that a
system has a “real physical state” – not necessarily com-
pletely described by quantum theory, but objective and
independent of the observer. This assumption only needs
to hold for systems that are isolated, and not entangled
with other systems. Nonetheless, this assumption, or
some part of it, would be denied by instrumentalist ap-
proaches to quantum theory, wherein the quantum state
is merely a calculational tool for making predictions con-
cerning macroscopic measurement outcomes."
There is also this paper, which discusses some loopholes the the
assumptions of the PBR theorem:
Implications of the Pusey-Barrett-Rudolph quantum no-go theorem
Maximilian Schlosshauer, Arthur Fine
(Submitted on 21 Mar 2012 (v1), last revised 27 Jun 2012 (this version, v3))
Pusey, Barrett, and Rudolph introduce a new no-go theorem for
hidden-variables models of quantum theory. We make precise the class of
models targeted and construct equivalent models that evade the theorem.
The theorem requires assumptions for models of composite systems, which
we examine, determining "compactness" as the weakest assumption needed.
On that basis, we demonstrate results of the Bell-Kochen-Specker
theorem. Given compactness and the relevant class of models, the theorem
can be seen as showing that some measurements on composite systems must
have built-in inefficiencies, complicating its testing.
Comments: 4 pages. v2: tweaked presentation, new title; v3: minuscule
edits to match published version
Subjects: Quantum Physics (quant-ph)
Journal reference: Phys. Rev. Lett. 108, 260404 (2012)
DOI: 10.1103/PhysRevLett.108.260404
Cite as: arXiv:1203.4779 [quant-ph]
(or arXiv:1203.4779v3 [quant-ph] for this version)
Brent
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