<div dir="ltr"><div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Sep 8, 2023 at 5:35 AM BillK via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">QBism seems to be becoming popular, with more articles appearing.<br>
<br>
<<a href="https://theconversation.com/qbism-quantum-mechanics-is-not-a-description-of-objective-reality-it-reveals-a-world-of-genuine-free-will-200487" rel="noreferrer" target="_blank">https://theconversation.com/qbism-quantum-mechanics-is-not-a-description-of-objective-reality-it-reveals-a-world-of-genuine-free-will-200487</a>><br>
Quote:<br>
‘QBism’: quantum mechanics is not a description of objective reality –<br>
it reveals a world of genuine free will By: Ruediger Schack<br>
Published: March 29, 2023<br>
<br>
<<a href="https://medium.com/physics-philosophy-more/qbism-a-technical-discourse-34109e2b3c16" rel="noreferrer" target="_blank">https://medium.com/physics-philosophy-more/qbism-a-technical-discourse-34109e2b3c16</a>><br>
Quote:<br>
QBism — A technical discourse<br>
Sanjay Basu, PhD May 25, 2023<br>
Unraveling QBism: A Deep Dive into Quantum Bayesianism<br>
<br>
<br>
I asked AI to summarize and explain QBism:<br>
<br>
QBism, also known as Quantum Bayesianism, is a philosophical<br>
interpretation of quantum mechanics that combines elements of<br>
subjective probability and Bayesian reasoning. It was developed by<br>
physicist Christopher Fuchs and his colleagues in the early 2000s as a<br>
response to the long-standing interpretational issues and paradoxes in<br>
quantum theory.<br>
<br>
At its core, QBism asserts that quantum mechanics is fundamentally<br>
about an agent's personal beliefs or degrees of belief rather than<br>
objective reality. It emphasizes the role of the observer and their<br>
subjective experiences in understanding quantum phenomena. According<br>
to QBism, the wave function, which describes the state of a quantum<br>
system, represents an agent's personal probabilities or expectations<br>
for different measurement outcomes.<br>
<br>
In QBism, probabilities are understood as subjective degrees of belief<br>
rather than objective frequencies or propensities. These probabilities<br>
are updated using Bayesian inference, a mathematical framework for<br>
updating beliefs based on new evidence. The agent's beliefs are<br>
represented by a probability distribution over possible measurement<br>
outcomes, and this distribution is updated using Bayes' theorem after<br>
each measurement.<br>
<br>
One key aspect of QBism is its rejection of the idea that quantum<br>
systems have definite properties before they are measured. Instead, it<br>
argues that these properties only exist in relation to an observer's<br>
measurements and their subjective beliefs. This view is often referred<br>
to as "participatory realism," as it suggests that reality is created<br>
through the interaction between the observer and the observed system.<br>
<br>
Another important concept in QBism is the notion of "quantum states as<br>
personalist Bayesian agents." According to this idea, quantum systems<br>
can be thought of as agents that update their own beliefs based on<br>
their interactions with other systems. This perspective allows for a<br>
more intuitive understanding of entanglement and non-locality in<br>
quantum mechanics.<br>
<br>
QBism also addresses the long-standing debate between wave-particle<br>
duality and the collapse of the wave function. It suggests that these<br>
concepts are not fundamental but rather emerge from an agent's<br>
interactions with quantum systems. The wave function is seen as a tool<br>
for making predictions about measurement outcomes, rather than a<br>
physical entity.<br></blockquote><div><br></div><div><br></div><div><div>One thing I would like QBists to explain, is if there is no outer reality, only my "degrees of belief", then how is it that my "degrees of belief" are able to factor a 1000 digit semiprime, as happens in a quantum computer? Something external to me must be doing this, no?</div><div><br></div><div>Jason</div><div><br></div></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
Overall, QBism offers a new perspective on the interpretation of<br>
quantum mechanics that places the observer and their subjective<br>
beliefs at the center of the theory. It provides a framework for<br>
understanding quantum phenomena in terms of personal probabilities and<br>
Bayesian reasoning, challenging traditional notions of objective<br>
reality.<br>
-----------------<br>
<br>
<br>
So, Many Worlds Interpretation is not required with QBism.<br>
<br>
BillK<br>
<br>
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</blockquote></div></div>