Quantum foundations Definition and 16 Threads

New Scientist recently published an article entitled 'A Bold New Take on Quantum Theory'. I found interesting Unfortunately, it is behind a paywall, but I will give my precis. How QM, which only predicts probabilities, gives rise to the solid, well-defined world around us is still a mystery...

A toy model might be to split the cat into two half-cats, each decohering the other. I'm intrigued by the idea that half-cat-1 is in a mixed state relative to half-cat-2 and vice versa. My question is, is there any reason to think that the actual cases observed by the two half-cats are going to...

Hi All I have never been particularly impressed with Tim Mauldin's general take on Bell and QM. I am reading an article of his at the moment. Here is an excerpt (lightly edited by Grammarly to have correct punctuation, etc). Start Quote But for expository purposes, the point is most...

As far as I know, we don't understand the apparent faster-than-light "communication" between a measured particle and one entangled to it. Does the Many Worlds Interpretation explain this? Does it have anything else to say about entanglement?

In the thread general-argument-that-entanglement-can-only-be-created-locally @Cthugha explains why the monogamy argument used by @DrChinese in his entanglement swapping experiment explanation is bunk. Given that the monogamy argument is bunk, if the raw measurement values of photons of 1 and 4...

At the heart of the theory of open quantum systems is the idea that the measurement statistics of many-body systems can be expressed in terms of a reduced density matrix, obtained by tracing over degrees of freedom that are irrelevant to the system of interest. In general, given a pure state...

The editors of high impact journal Nature Physics explain why the field of quantum foundations is important for physics. https://www.nature.com/articles/s41567-022-01766-x

I just finished a new paper, A. Neumaier, Quantum mechanics via quantum tomography, arXiv:2110.05294. (later renamed to) A. Neumaier, Quantum tomography explains quantum mechanics, arXiv:2110.05294. Abstract: Starting from first principles inspired by quantum tomography rather than Born's...

Summary:: When experimenting to improve a theory, account for the fact that your experimental equipment is made using the very same theory which you are trying to improve. 1.) It would take many decades (~ 80 years?) to design and make equipment entirely using a proposed new theory which has...

Recently, it has come to my attention a field called Quantum Foundations. This is exactly what brought me into Physics, even though back then I didn't know it was a research area. In my Physics classes, I got disappointed and unmotivated at the "Shut up and calculate!" attitude of my Physics...

I'm looking for a book on foundation of quantum mechanics. I started reading the book "do we really understand quantum mechanics" of franck laloë , and it seems to be very chatty and long. Do you have any recommendations? Thank you

Is it possible for new forces or fields of nature to be connected to quantum foundations? For example, new forces or fields that choose the decoherent histories or branches. Or generally actualize one of the decoherence branches? Or should new forces or fields of nature be reserved for...

Physicists often discuss interpretations of quantum mechanics (QM), but they rarely discuss interpretations of relativity. Which is strange, because the interpretations of quantum non-locality are closely related to interpretations of relativity. The field of interpretations of relativity is...

What are the best books on QT Foundations out there? This seems to be a difficult question which has very different answers depending on who you happen to ask. There seem to be at least two different levels, e.g. intermediate texts and advanced texts, with a very wide gap in between, which is...

Hi all, I have been trying to read up on quantum foundations after being first introduced to it on this Perimeter Institute page: https://www.perimeterinstitute.ca/research/research-areas/quantum-foundations/more-quantum-foundations However, I have had difficulty finding notes and papers on...

Not sure if this was posted but I came across a fairly recent online journal specializing on Quantum foundations that some might find interesting: http://www.ijqf.org/wps/wp-content/uploads/2014/08/IJQF-flyer1.pdf http://www.ijqf.org/ Some topics issues that will be published/discussed...