On 3/7/2020 4:54 PM, Bruce Kellett wrote:
On Sun, Mar 8, 2020 at 11:25 AM Alan Grayson <[email protected]
<mailto:[email protected]>> wrote:
On Friday, March 6, 2020 at 1:22:30 PM UTC-7, Philip Thrift wrote:
Sean Carroll
@seanmcarroll
·
What really happens to Schrödinger’s cat is that it becomes
entangled with its environment, so that the wave function
comes to describe multiple almost-classical worlds! Happens to
all of us, and nicely explained in this @veritasium video.
https://twitter.com/seanmcarroll/status/1235999175428333568
@philipthrift
I've asked this before and might have gotten some replies, but I
can't recall what they were. Many of the quantum paradoxes arise
due to a particular interpretation of superposition, namely, that
all alternatives happen simultaneously (before measurement). Why
can't superposition be interpreted to mean that each alternative
has a probability of occurrence and nothing more? TIA, AG
In a collapse or an epistemic interpretation, that is exactly what it
means.
The problem is saying exactly when the Schroedinger equation stops
describing the evolution and the alternative happens, i.e. the wf
collapses. In QBism it's when you learn the result and you update your
knowledge. In the Transactional interpretation it's when an interaction
is realized. I think Zurek's quantum Darwinism could be given this
interpretation: when the cross terms in the pointer basis become
sufficiently small.
Brent
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