Questions tagged [quantum-interpretations]

This tag is for questions relating to what, if anything, the quantum mechanical formalism and experimental results say about the way the world works.

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How is particle type "encoded" in wave function?

Let single-particle wave functions most generally be given by $\big|\psi\big\rangle\in\mathcal{H}$, where $\mathcal{H}=L^2$ is the space of square-integrable functions. In the first place, the wave ...
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Books about Quantum Contextuality

Does anybody know some bibliography about Quantum Contextuality? Why is such a framework a generalización of Bell inequalities? Why has it something to do with hidden variables theories?
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Does ensemble interpretation of QM involve hidden variables?

The ensemble interpretation of quantum mechanics considers the quantum state description to apply only to an ensemble of similarly prepared systems, rather than supposing that it exhaustively ...
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Hong-Ou-Mandel (HOM) effect in Bohm interpretation

Can someone answer how is Hong-Ou-Mandel (HOM) effect treated in Bohm interpretation? I looked on the net but couldnt find anything.
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Bohr interpretation of Mach-Zehnder interferometer

Consider MZI for single photon. Bohr or Copenhagen interpretation holds that the wave de Broglie attached to a particle is just amplitude(s) of probability (e.g. some information which is located (I ...
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Multiple (Non-Interacting) Universes?

Before anything, I would like to clarify that I am aware that this is speculative physics more than established mainstream physics (and Smoot is not claiming that his ideas are true). However I think ...
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Replacement of Born rule to understand consciousness [closed]

This postulate should replace the Born rule as it makes the Born rule precise w.r.t. decoherence: "If a consciousness is in a superposition $\sum |k_i \rangle$, such that $\langle k_i|k_j\rangle=...
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Have we actually verified the claim that macroscopic objects collapse wavefunctions?

Copenhagen interpretation claims this, but have we actually verified this? There exist two options: Objective collapse: Consider a large isolated box inside which there is a macroscopic classical ...
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Projection Postulate of Quantum Mechanics. Where does the Projection occur in the detection process?

This question is about a specific instance of the measurement problem. Let's say we excite a single emitter producing a single photon (described by state $ |\psi_{i}>$), which then "travels&...
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The intepretation and maths behind the many-worlds interpretation of quantum mechanics

recently I started reading the book "Something deeply hidden" by Sean Caroll. In the book he talks about the many-worlds interpretation of quantum mechanics as a more elegant way of thinking ...
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Which interpretation of quantum physics interprets superpositions in the sense of "an object *really* being in two places at once"? [closed]

In popular scientific literature one often reads of "objects being in two places at once" as a verbal way of explaining superposition of states (in the mathematical view of elements of a ...
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What happens with the positions in De Broglie–Bohm theory after a filtering mesurement?

According to Quantum Mechanics (QM) after a filtering measurement of an observable $\hat{\text{M}}$ where the result $M_1$ was obtained, the wave function is projected to a Hilbert subspace which is ...
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How does branching from the many-worlds interpretation come from the assumption of a universal wavefunction?

In the many-worlds interpretation, the cut between the observed and the observer, the quantum and the classical is removed, and it logically follows that there can be a universal wavefunction. When ...
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Elitzur–Vaidman bomb tester in many-worlds interpretation

https://en.wikipedia.org/wiki/Elitzur%E2%80%93Vaidman_bomb_tester In the Elitztur-Weidman experiment there are bombs that are triggered by a single photon hitting their detector, and with some ...
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What if we send humans through the double slit? [closed]

Lets say that we have a universe that has just 3 things inside, me in a specially designed suit capable of keeping me alive while near absolute 0 as to enlarge my de broglie wave-length, double slit ...
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Meaning of the "Thermal Interpretation" of quantum mechanics (A. Neumaier)

I would like to understand the follow statements in the context of the thermal interpretation: https://arnold-neumaier.at/physfaq/therm/topics/s24.html “If one knows the state of the universe ...
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Epistemic vs. ontological interpretations of QM

There are several posts under   [quantum-interpretations] epistemic ontological,   but I'm not seeing an answer to my question there (nor from google searches)... I hadn't thought about it very much, ...
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How does pilot wave theory explain "identical particle" interference?

Pilot wave theory says that there exist waves in 3D space which carry particles. This explains, say, the double slit experiment. But this does not explain the behavior of identical particles. ...
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Have there been any experiments that ruled out an interpretation of quantum mechanics?

Historically, have there been any experiments that ruled out an interpretation of quantum mechanics, or an experiment that could do so? I understand that interpretations are made to give the same ...
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Many Worlds as Many Histories?

I was reading this paper from George Smoot (https://arxiv.org/abs/1003.5952) where he assumes the holographic principle as true and conjectures that our universe would be encoded on the "surface&...
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Bell's theorem outside of the context of entanglement

I am an undergrad college student and have been watching videos on YouTube explaining Bell's theorem / inequality and how it shows that there cannot be local hidden-variable theories for entanglement. ...
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I'm trying to understand this paper on Born rule in Many-Worlds Interpretation

https://arxiv.org/abs/1405.7907 In particular I would like to understand this paragraph, right before chapter 6: This route to the Born Rule has a simple physical interpretation. Take the wave ...
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How to compute the exact universe branches in many worlds interpretation?

Many worlds interpretation says that, whenever a system's state gets decohered over time, such that no interference between the decohered states is possible anymore, the universe branches, with there ...
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What is the unitary operator which describes a measurement in the Many Worlds Interpretation?

According to the Copenhagen interpretation, the process of measurement is described by the collapse of the wavefunction, which is a non-unitary process. The Hermiticity of a Hamiltonian guarantees ...
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Many Worlds interpretation does away with EPR, but what about ER=EPR?

When I heard David Wallace say that Many Worlds does away with the so-called 'spooky action at a distance' referred to in the EPR paper, I bought Sean Carroll's book 'Something Deeply Hidden'. From ...
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How does the many-worlds interpretation solve spooky action at a distance?

If we take the classic example of two particles that are entangled with up spin and down spin, and we separate these particles a few light years apart and then observe them one after the other, they ...
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Does the many worlds interpretation not violate determinism?

Okay, consider me dumb here. I’m not a physicist but the question genuinely bugs me and i think there’s a gap in my understanding. But my question presupposes determinism as does the many worlds ...
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Understanding the Measurement Problem - Is this a good analogy? [closed]

I have asked the question in a better way: Does Vantage Point explain Bell's Inequality's Experimental Results? This question may remain closed. It can be head-melting to conceive of many ...
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Is there a quantum interpretation according to which quantum tunnelling is impossible at certain level?

Is there a quantum interpretation according to which quantum tunnelling becomes physically impossible at certain (macroscopic) level?
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Are Temporal Paradoxes possible within the Many Worlds Interpretation?

Are Temporal Paradoxes possible within the universe of the MWI, or is the idea not possible within this interpretation? I guess if one would alter something in the past within the MWI universe, they ...
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Is Bohmian mechanics an interpretation of quantum mechanics?

I don't understand why some people argue that Bohmian quantum mechanics is just an interpretation of quantum mechanics. In addition to the usual Schrödinger equation, we have the following ...
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Is there a rigorous definition for what a "complete" theory without "hidden variables" is?

I find only vague characterizations of what a theory that is complete and without hidden variables is supposed to be. Such as a theory that is complete means that there is no lack of knowledge about ...
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Is there a quantum interpretation which holds that quantum mechanics completely cease to apply at a certain level?

An interpretation which holds that there is a sharp threshold between quantum objects and classical objects. If there is such an interpretation: how is the threshold itself explained in the framework ...
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At what "level" does the environmental decoherence completely surppress quantum tunnelling?

In this regard, is it possible for an extremely tiny (but still visible with the naked eye) object to perform spontaneous quantum tunnelling despite of the fact that decoherence is at work?
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Why extremely tiny (but still visible with the naked eyes) objects do not quantum tunnel? [duplicate]

What is the reason that we don't see such objects quantum tunnel? Decoherence? If YES, at what "level" does the decoherence completely suppress quantum tunnelling? Where is the "...
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Many worlds: would branching occur in a universe with only two electrons in it?

I understand Everett's fundamental insight: human beings and measurement devices are made up of the same quantum particles as the ones being measured, therefore it makes sense to postulate that we ...
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Meaning of operators that are neither observables nor transformations

In single particle QM, operators mainly had two roles: They either were hermitian, so any state the system was in could be expanded in eigenstates of said operator, with an eigenvalue assigned to each ...
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What is the meaning of uncertainty principle in the case of hidden-variable theories?

What would be the meaning of the uncertainty principle in the case of hidden-variable interpretations of quantum mechanics, especially contextual hidden-variable theories? Edit: Another way to put ...
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The collapse of Wave function isn't a physical process - but then why hasn't everything blurred into complete uncertainty?

Sabine Hossenfelder very coherently points out the "The real problem with quantum mechanics" in the following clip: https://www.youtube.com/watch?v=LJzKLTavk-w&t=583s Shortly after ...
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What is contextuality?

I have been trying to get and idea of contextuality in quantum mechanics for a while but I still do not get it. Reading Wikipedia lead on quantum contextuality, Quantum contextuality is a feature of ...
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Probability in the Multiverse Interpretation of Quantum Mechanics [duplicate]

The Multiverse Interpretation of Quantum Mechanics interprets a quantum decision as different universes, each with each outcome. I was wondering how probability plays into this. For example, if we ...
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Are only local hidden variables at odds with special relativity?

So hidden variables in quantum mechanics are at odds with special relativity. I can understand this to be the case with local hidden variables, but does this also hold for non-local ones? Often one ...
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Quantum mechanics as probability tree

Apologies in advance for any pain my ignorance may cause. My intuition for quantum mechanics is kind of probability-tree-y. Given some unitary propagator f it seems ...
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Does the Multiverse Theory rely on Superposition?

Note: I'm not asking if the Multiverse Theory and the MWI are the same thing, cf. e.g. this Phys.SE post. If I understand it correctly, the Multiverse Theory doesn't rely on the Many Worlds ...
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According to the MWI, does the universe always split with all possible outcomes or only splits for those particles that were observed?

Sorry in advance if this is a stupid question. The Many World Interpretation (MWI) says that, at every point in time, the universe splits into a multitude of existences in which every possible ...
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Is there a natural principle that forbids real wavefunction collapse?

The wavefunction evolves unitary. We can apply a unitary evolution operator containing the Hamiltonian (which shows the relation between time and energy). This evolution is smooth and continuous. And ...
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Particle decay in Everett's many-worlds interpretation (MWI) - is it probabilistic?

I've watched Sean Carroll videos where he describes how to use Everett's many-worlds interpretation (MWI) for e.g. https://en.wikipedia.org/wiki/Schr%C3%B6dinger%27s_cat. Superposition of one particle'...
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How can we define an usable coordinate system for quantum systems? [closed]

As A. Einstein wrote in his introductory book on special relativity (translated from the Portuguese version): Any spacial description of the localization of any event or object is based on the ...
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Question on the paper "Objective interpretations of quantum mechanics and the possibility of a deterministic limit"

At the moment I am reading the paper "Objective interpretations of quantum mechanics and the possibility of a deterministic limit" from A. Sudbery. I have problems understanding a certain ...
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How to find the probability current density of hydrogen atom wave function?

Can someone give me a book recommendation or a pdf where I can find how to get the radial, polar and azimuth component of it? I try to do it myself but I can't really figure out what to do next,

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