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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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What's the Name of this QM Interpretation?

I've thought of an interpretation of quantum mechanics which I have so far been unable to find anywhere in the literature. Since the subject has been studied for so long, I am fairly sure that my ...
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Randomness in Quantum Mechanics

Is the quantum world really random?How can one be sure that there are no variables that can actually predict the outcome like they do in Newtonian physics?
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The Bohm interpretation and Schrodinger's cat

I was wondering how the Bohm interpretation of quantum mechanics would affect the Schrodinger's cat experiment. Would it imply that the cat would be in one state and never in superposition, so the cat ...
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1answer
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Why does MWI need decoherence theory and how can these models be combined?

As far as I understood decoherence theory, it explains, why we are not able to measure superposition of macroscopic objects in some specific base, which turns out to be the position base in most cases....
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Do psi-ontic models rule out decoherence etc.?

My question is based on several theorems which have some features in common. First of them is famous PBR-theorem. It states that quantum state cannot be considered as statistical and does not ...
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3answers
81 views

The principle of Quantum indetermination

Well, it is a amazing fact that Quantum world deals with indeterminism, one can't tell about the system without directly "seeing" it. (Many novels, short stories are also formed on the same) My ...
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Dirac-like formulation of quantum electrodynamics

For classical mechanics there is a newtonian formulation (calculating accelerations and integrating to get velocities and positions). There is also an equivalent Lagrangian formulation (finding a path ...
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1answer
113 views

What becomes of conservation of energy in many-worlds theories?

Disclaimer, my interest in physics is purely recreational; also, in spite of my research so far, I couldn't really make sense of the question I am asking here. What follows is my understanding so far,...
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Quantum Mechanic Interpretations

Context I was watching this video "Do we have to accept Quantum weirdness?" and it said how currently there are several interpretations of quantum mechanics that are consistent with the facts. ...
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625 views

Is quantum mechanics truly probabilistic?

Probability arises inherently from a lack of information. For example, if I were to take a ball out of a bag with 3 yellow and 2 white balls, I would have a 0.6 probability of getting a yellow and a 0....
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Does the Uncertainty Principle really rule out the existence of definite trajectory of electrons?

Excerpt from my textbook It is impossible to determine simultaneously, the exact position and exact momentum (or velocity) of an electron. It rules out the existence of definite trajectories ...
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2answers
126 views

Theory of everything [closed]

I have a theoretical question regarding the disconnect between the quantum world and the standard physical world and the inability to combine the two. My question is simple. Is it possible that the ...
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1answer
146 views

Is there a consensus about the trueness of the randomness in QM? [duplicate]

I personally believe that there is a very strong case in favor of true randomness in QM but not being a physicist I would like to know from experts if there is a consensus about this. @John Rennie: ...
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Does anyone have an opinion on the quantum theory of Diederik Aerts? [closed]

I'm new to this site and just saw that someone asked a question (over 5 years ago ago now) on why boundaried objects in the macro world (that we experience everyday as macro sized, but which must ...
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“What is a thing?” — Coecke versus Kastner

The subject's from Coecke's https://arxiv.org/abs/0803.0417 and my question's essentially to "compare and contrast" that with Kastner's https://arxiv.org/abs/1707.09034 which appeared today. Seems to ...
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2answers
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Quantum Bayesianism (QBism) and the double slit experiment

How is the following experimental fact interpreted in Quantum Bayesianism (QBism)? In a double slit experiment we measure position directly after the slits. Because of that the interference pattern on ...
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What is a 'wavicle?'

What is a wavicle? I learned in electronics class that electrons are little particles. In physics they even say that the electron orbits the nucleus thus exhibiting angular momentum. But in chemistry ...
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1answer
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Implication of Born's rule on the superposition principle

BACKGROUND Born's rule quantifies the interference pattern of a single quantum particle going through two possibles paths A and B as $P = |A|^2 + |B|^2 + ⟨A|B⟩ + ⟨B|A⟩$. The standard interpretation ...
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1answer
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Psi Ontic interpretations of QM that can be made relativistic?

What Psi Ontic interpretations of QM can be made relativistic? Is the Many Worlds interpretation the only one?
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If the Many Worlds interpretation (MWI) cannot derive the Born rule, would that mean that it is wrong?

All attempts at deriving the born rule in MWI have been shown to be circular in some way. So if it turns out that MWI cannot derive the born rule without some form of circularity, does that mean that ...
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Confusion by Murray Gell Mann video and Bell's Theorem

I'm trying to understand 3:02 in this video: https://www.youtube.com/watch?v=AlIlkn3OxMI&t=184s He seems to be saying that the measurement of a property one photon has no effect on the other. So ...
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1answer
272 views

Are there any derivations of the born rule from MWI that work?

Are there any derivations of the born rule from MWI that are not circular and are mathematically consistent? I ask this because Florin Moldoveanu insists that such a derivation from MWI doesn't exist. ...
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How does the EPE-DH interpretation of quantum mechanics account for interaction-free measurement?

The extended probability ensemble decoherent histories (EPE-DH) interpretation of quantum mechanics proposed by Murray Gell-Mann and James Hartle posits that there is one real fine-grained history of ...
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Why can't GRW theory be easily tested?

To me it seems that no matter if GRW theory is true, there would already be a lot of observations and evidence for/against it, since it will in quite simple situations make different predictions from ...
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Are all instances of quantum non-locality problem artifacts of the use of classical concepts in quantum physics?

Consider experiments involving entangled spins, say two-spin 1/2 particles in the singlet state: $$\left|\psi\right> =\frac{1}{\sqrt{2}}\left[\left|\uparrow\downarrow\right> - \left|\downarrow\...
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Why would Pilot-Wave be wrong?

If this question has already been asked or is super basic, apologies. I'm a physics novice and this is my first question on this side of the site. In classical physics, waves and particles are ...
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Can multiple branches be identical in MWI?

As I understand it, Many Worlds Interpretation of Quantum Mechanics states that all possibilities are realized. That part is easy enough to understand. But my question is: Does there exist multiple ...
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493 views

How do we know that Quantum Mechanics isn't simply a theory of approximations? [duplicate]

From what I understand, QM is all about uncertainty. The wavefunction (or rather $|\Psi|^2$) gives us a probability of finding a particle at a certain point. Then, we measure the particle, and find ...
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1answer
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Does many-worlds interpretation really imply every possible “combination”?

I have a question (as a layman) about many-worlds interpretation. Let's say we are indeed living in that kind of universe. From Wikipedia: In layman's terms, the hypothesis states there is a very ...
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1answer
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Assuming MWI of QM, how can we describe / constrain the likely range of existing “worlds”?

Assumptions: This question assumes that we take the Many Worlds Interpretation of quantum mechanics as ontologically true. I use “worlds” as a description of quantum systems that have decohered to ...
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1answer
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Many worlds interpretation of quantamechanics vs eternal information

Whats the main difference between the theory of many worlds interpretation in quantum mechanics and the theory of eternal inflation or are they the same in regard of their vision to the multiverse ?
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271 views

A non-metaphysical interpretation of measurement in quantum mechanics

In quantum mechanics, measurement plays a fundamental role and to me, its role is usually described in a rather odd way. The Copenhagen interpretation states thus When that device makes a ...
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265 views

Double slit experiment with 'interaction free measurement' to read out the 'which route' information

We know that in the double slit experiment, the reading out of the 'which route' information will destroy the interference pattern. But the reading out of the 'which route' information can be ...
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Imaginary part of the waveefunction in quantum mechanics [duplicate]

I wonder what is the reason for wave function in quantum mechanics to have an imaginary part... How do we interpret the utility of the imaginary part?! As we know the wave function it self does not ...
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What defines which universe I will end up in? [closed]

Following this question about the Many Worlds Interpretation of QM in which MW is stated to be deterministic: What "chooses" which universe I will be in, i.e., which outcome I will see? I actually ...
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2answers
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Spooky-action-at-distance, why it was claimed by Einstein?

If I understand "popular quantum mechanics" right, there is no faster-than-light communication via two entangled particles, because changing one of the particles (with the purpose to transfer a signal ...
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4answers
462 views

Is the wavefunction a real physical wave or only a mathematical abstraction? [closed]

Does interaction with physical slits in a double slit experiment indicate that the wavefunction is a real physical wave, as opposed to a mathematical abstraction? This question pertains to the psi ...
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1answer
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What research (if any) is being done with regard to a hidden variable theory of quantum mechanics?

From Bell’s theorem and the Kochen-Specker theorem we know that any hidden variable model hoping to reproduce the predictions of quantum mechanics must be both non-local and contextual. What model ...
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1answer
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Causality according to Dirac

Dirac writes in page number 4 of his "Principles of Quantum Mechanics": It is usually assumed that, by being careful, we may cut down the disturbance accompanying our observation to any desired ...
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What is an observer in QFT?

In non-relativistic quantum mechanics, an observer can be roughly describe as a system with wavefunction $\vert \psi^O \rangle$ which, upon interaction with another system $\vert \psi^S\rangle$ (in ...
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Why does entanglement not imply hidden variables?

By the causal symmetry of spacelike-seperated events, the statement "measurement of particle 1 causes subsequent collapse for particle 2" is equivalent to "measurement of particle 2 causes subsequent ...
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Meaning of contextuality

I'm trying to understand what contextuality means in quantum mechanics (-> Kochen-Specker theorem). Can someone describe '(non-)contextuality' in a mathematical way? Wikipedia says something like 'the ...
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1answer
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Understanding the Mathematical Formalisms of Everetts MWI

Link to article: http://jamesowenweatherall.com/SCPPRG/EverettHugh1957PhDThesis_BarrettComments.pdf I'm writing an essay on Everettian MWI and its incompatibility with Born Rule probabilities. I ...
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Is it correct to say a quantum particle is in both “states” at the same time?

In popular media, and even in introductory books it is common to say that quantum objects are characterized by the non-intuitive notion of being in two or more eigenstates at "the same time". An ...
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1answer
203 views

Observation effect in double slit experiment [duplicate]

I have watched some of the lectures given by Brian Greene and Lawrence Krauss about the observation conundrum encountered during the double slit experiment. Can anybody answer me this question? Is ...
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1answer
126 views

MWI universal wave function question?

In MWI, there is only one wave function in the universe ( the universal wave function). So say if I detected a particle and its wave function decoheres, since the universal wave function never ...
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Position of collapse in von-Neumann chain

I have often seen the following claim (for instance on Wikipedia: https://en.wikipedia.org/wiki/Von_Neumann%E2%80%93Wigner_interpretation): In his 1932 book The Mathematical Foundations of Quantum ...
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Bell's theorem and how it solves the EPR paradox

Could someone explain to me how Bell's theorem solves the EPR paradox and 'spooky action at a distance'? From what I understand, when measuring a state, say spin up in the x direction, the wave ...
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Why does the universe need quantum superposition? [closed]

My question is not about the nature or reality of quantum superposition, superposition is a fact and no argue about that. My question is: What is the purpose of superposition and why does the ...
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Is there any physical significance to the orthonormality of states in a wave function?

In the infinite square well with bounds $0$ and $a$, the solutions to the time independent Schrodinger equation are: $$ \psi_n(x)=\sqrt{\dfrac{2}{a}}\sin{\left(\dfrac{n\pi}{a}x\right)} $$ One of the ...