it would be nice if we could get something as simple as email working on the forum.....
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There's No Objective Reality
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it would be nice if we could get something as simple as email working on the forum.....
Aletheia Athanatos
Member
Experimental test of local observer-independence
Experimental test of local observer-independence
The scientific method relies on facts, established through repeated measurements and agreed upon universally, independently of who observed them. In quantum mechanics, the objectivity of observations is not so clear, most dramatically exposed in Eugene Wigner's eponymous thought experiment where two observers can experience seemingly different realities. The question whether these realities can be reconciled in an observer-independent way has long remained inaccessible to empirical investigation, until recent no-go-theorems constructed an extended Wigner's friend scenario with four observers that allows us to put it to the test. In a state-of-the-art 6-photon experiment, we realise this extended Wigner's friend scenario, experimentally violating the associated Bell-type inequality by 5 standard deviations. If one holds fast to the assumptions of locality and free-choice, this result implies that quantum theory should be interpreted in an observer-dependent way.
Here's the actual paper (in PDF format):
https://arxiv.org/pdf/1902.05080.pdf?
Experimental test of local observer-independence
The scientific method relies on facts, established through repeated measurements and agreed upon universally, independently of who observed them. In quantum mechanics, the objectivity of observations is not so clear, most dramatically exposed in Eugene Wigner's eponymous thought experiment where two observers can experience seemingly different realities. The question whether these realities can be reconciled in an observer-independent way has long remained inaccessible to empirical investigation, until recent no-go-theorems constructed an extended Wigner's friend scenario with four observers that allows us to put it to the test. In a state-of-the-art 6-photon experiment, we realise this extended Wigner's friend scenario, experimentally violating the associated Bell-type inequality by 5 standard deviations. If one holds fast to the assumptions of locality and free-choice, this result implies that quantum theory should be interpreted in an observer-dependent way.
Here's the actual paper (in PDF format):
https://arxiv.org/pdf/1902.05080.pdf?
Aletheia Athanatos
Member
If you're not a physicist at home with equations such as:
How should you set about evaluating such a paper?
Ask a random journalist? No. 'science journalism' in a majority of news sources is usually sensationalist and often inaccurate.
Your best bet is to look at the papers citing it:
Google Scholar
For a start, you want actually published papers, not pre-prints, and ones published in reputable journals. For example:
A strong no-go theorem on the Wigner’s friend paradox | Nature Physics
Since what we're talking about here is the interpretation of quantum mechanics, you want to pay particular attention to alternative frameworks. For example:
The View from a Wigner Bubble - Foundations of Physics
Phys. Rev. A 101, 032107 (2020) - Decoherence framework for Wigner's-friend experiments
Implications of Local Friendliness Violation for Quantum Causality
How should you set about evaluating such a paper?
Ask a random journalist? No. 'science journalism' in a majority of news sources is usually sensationalist and often inaccurate.
Your best bet is to look at the papers citing it:
Google Scholar
For a start, you want actually published papers, not pre-prints, and ones published in reputable journals. For example:
A strong no-go theorem on the Wigner’s friend paradox | Nature Physics
Since what we're talking about here is the interpretation of quantum mechanics, you want to pay particular attention to alternative frameworks. For example:
The View from a Wigner Bubble - Foundations of Physics
Phys. Rev. A 101, 032107 (2020) - Decoherence framework for Wigner's-friend experiments
Implications of Local Friendliness Violation for Quantum Causality
Aletheia Athanatos
Member
Can I be the first to say I was already of this opinion?
Yeah, no, that's precisely what you shouldn't do.
Never take in a headline, and nod at it just because it agrees with what you already believe.
What the brain ends up doing is remembering the event as "I saw yet more evidence that I'm right", when what actually happened was you didn't see evidence at all... just a claim (of unknown reliability) that such evidence exists.
Secret Chief
Veteran Member
Do you have evidence that I didn't read the OP?
Aletheia Athanatos
Member
Secret Chief
Veteran Member
And we both managed to express our opinion.None beyond absence of evidence you did.