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#quantumfoundations

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Rafael Wagner

This week was good for #QuantumFoundations in the Arxiv; this one is particularly interesting because the usage of operational theories is not only a foundations matter, but it is highly used in applications and proofs of quantum information advantage.

It is a constant aspect: quantum foundations keep proving itself interesting for the applied physicist. In defense of quantum foundations, here is an g(old) gem!

(5/n), n=5.

arxiv.org/abs/1003.5008

arXiv.orgWhy Physics Needs Quantum FoundationsWe discuss the motivation for pursuing research on the foundations of quantum theory.
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Rafael Wagner

#QuantumFoundations #ArXiv

Just finished reading an interesting paper discussing non-linear dynamics.

The claim can be explained with the following task: Consider a researched in its laboratory (system S) and a physical system being tested (system A). Can the researched discriminate/learn if the total system SA is coherent, performing only local tests inside the laboratory?

The work shows that this is possible iff the theory allows for non-linear dynamics. (1/n)

scirate.com/arxiv/2302.13421

SciRateQuantum dynamics is linear because quantum states are epistemicAccording to quantum theory, a scientist in a sealed laboratory cannot tell whether they are inside a superposition or not. Consequently, so long as they remain isolated, they can assume without inconsistency that their measurements result in definite outcomes. We elevate this feature to a postulate, which we call Local Definiteness. If quantum states are ontic, this postulate must be derived by assuming the dynamical law is linear. On the other hand, if quantum states are epistemic then the postulate comes for free. We can then use it to prove that the dynamics must be linear. Therefore the simplest explanation for why experiments keep failing to find evidence of non-linear dynamics is that quantum states are epistemic.
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Mike Smith

Interesting unpacking from Hossenfelder on the issues she has with particle physics.

But I'm not sure she herself is immune from the motivational issues she cites. For example, are her reasons for preferring hidden variable theories in QM really any different from the ones she's criticizing here?

To be fair, I doubt anyone really avoids these issues. Testing matters! And which tests to fund seems inevitably a judgment call.

youtube.com/watch?v=lu4mH3Hmw2
#physics #TheoreticalPhysics #ParticlePhysics #quantum #QuantumFoundations

YouTubeWhat's Going Wrong in Particle Physics? (This is why I lost faith in science.)By Sabine Hossenfelder
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Aggie Branczyk 🦋

Q16 (part B): What is your reason for NOT favoring De Broglie - Bohm theory?

A: It is too complex compared to other interpretations - i.e. Ockham's razor

B: It has hidden variables, which makes the theory untenable according to Bells inequality

C: Nonlocality

D:The notion of all particles possessing a quantum potential that guides them seems too farfetched

E: Other

· 7 people · Closed
#Quantum#QuantumFoundations#QuantumMechanics
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Aggie Branczyk 🦋

Q16 (part A): What is your reason for NOT favoring De Broglie - Bohm theory?

A: It is too complex compared to other interpretations - i.e. Ockham's razor

B: It has hidden variables, which makes the theory untenable according to Bells inequality

C: Nonlocality

D:The notion of all particles posessing a quantum potential that guides them seems too farfetched

E: Other

· 8 people · Closed
#Quantum#QuantumFoundations#QuantumMechanics
Public
Mike Smith

Ethan Siegel here argues we shouldn't explore quantum interpretations, because they can't currently be adjudicated empirically.

It's worth noting that Einstein and colleagues received this type of criticism with their 1935 EPR paper. If everyone had heeded it, this year's Nobel prizes for entanglement experiments wouldn't exist.

Curiosity, and attempted explanations, are a good thing, as long as we remember the status of those explanations.

bigthink.com/starts-with-a-ban
#QuantumFoundations #quantum

Big ThinkWhat is the true nature of our quantum reality?For nearly a century, physicists have argued over how to interpret quantum physics. But reality exists independent of any interpretation.
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Aggie Branczyk 🦋

Q15 (part B): What is your main reason for NOT favoring the many worlds interpretation?

A: The notion of multiple worlds seems too farfetched

B: The notion of multiple minds seems too farfetched

C: The interpretation is too complex compared to others - i.e. Ockham's razor

D: The interpretation is unable to explain the Born rule

E: It can never be corroborated experimentally

F: Other (leave a comment)

· 5 people · Closed
#Quantum#QuantumFoundations#QuantumMechanics
Public
Aggie Branczyk 🦋

Q15 (part A): What is your main reason for NOT favoring the many worlds interpretation?

A: The notion of multiple worlds seems too farfetched

B: The notion of multiple minds seems too farfetched

C: The interpretation is too complex compared to others - i.e. Ockham's razor

D: The interpretation is unable to explain the Born rule

E: It can never be corroborated experimentally

F: Other (leave a comment)

· 7 people · Closed
#Quantum#QuantumFoundations#QuantumMechanics
Public
Aggie Branczyk 🦋

Q14: What is your main reason for NOT favoring the Copenhagen interpretation?

A: The role the observer plays in determining the physical state is too important

B: The paradoxes that arise on the macroscopic scale, e.g. Scrödinger's cat and Wigner's friend

C: Nonlocality

D: Quantum mechanics describes nature as it really is

E: Other (leave a comment)

· 2 people · Closed
#Quantum#QuantumFoundations#QuantumMechanics
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