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.

Filter by
Sorted by
Tagged with
0
votes
1answer
54 views

Settling Copenhagen Interpretation / Measurement in QM & Existence of Quantum Gravity

It is my understanding that there are many interpretations of observation/measurement in Quantum Mechanics (I am only familiar with the Copenhagen one). The Schrodinger's Cat experiment forms a ...
4
votes
5answers
102 views

How do Many-world interpretation explain we live in a “statistically right” universe?

Consider a $n$ identical copies of spin state $|\phi\rangle=\frac{1}{\sqrt{2}}\left(|\uparrow\rangle+|\downarrow\rangle\right)$. Now we measure if the spin up or down. According to MWI, there always ...
-4
votes
1answer
41 views

Question on hidden variable theory of QM [closed]

my understanding from careful study of Bells thm is that there may be a deep subtlety that is not ruled out, but is probably very minimally studied in the literature. however the literature is vast, ...
0
votes
0answers
29 views

Many-worlds interpretation and the Hamiltonian

In Everett's Many-worlds Interpretation of QM, Schrodinger's equation is never violated (unlike in Copenhagen Interpretation). But how is this even possible? When you measure a system with respect to ...
0
votes
0answers
38 views

Many-world interpretation and absolute time

Consider a quantum system $S$ in superposition of two state,with an observer $A$, forming a bigger quantum system $S'$, with observer $B$. At $t=0$, observer $A$ measure $S$ and according to MWI, the ...
1
vote
1answer
64 views

Kochen-Specker theorem for infinite-dimensional Hilbert space

I would like to understand the mathematical content of Kochen-Specker theorem. This theorem states the following: If the dimension of a Hilbert space $\mathcal{H}$ is $>2$ then there is no ...
0
votes
1answer
39 views

Interpretation on basic results about Momentum Probability Distribution $\|\chi (k)\|$

hope you're all doing well. There might be questions related to this topic but I couldn't stand other responses mainly because I just began learning QM. There's this problem on QM1 (Quantum Mechanics ...
-5
votes
2answers
70 views

Is there a mechanism behind the splitting of two superimposed states in the many-worlds theory of QM? [closed]

According to the many-worlds theory of QM (of which I'm not a fan), two superimposed states (in whatever form) in one branch have a chance of ending up in one of the two next branches in accordance ...
1
vote
1answer
106 views

How does many-worlds theory explain Bell's inequality?

How are the correlations in the experiment proposed by John Bell explained by many-worlds theory? I understand that the assumption of a measurement having a single outcome, is not supported by many-...
0
votes
1answer
32 views

It seems like the many-world hypothesis would explain the Fermi paradox?

The fermi paradox asks why we don't see more complex life in the universe if we exist? Essentially, it seems either would naturally develop in our universe, in which case it would be plentiful, or it ...
0
votes
1answer
37 views

Regarding Pilot Wave Theory [duplicate]

Not as popular as the Copenhagen interpretation perhaps, but I'm truly intrigues to know the intricacies of the de Broglie-Bohm Theory. However, I could find absolutely no source which could teach me ...
0
votes
2answers
57 views

Is it possible the many-worlds hypothesis explains dark matter? [closed]

To provide context for the title, is it possible that dark matter is just gravity from other 'branches' of the universal wave function that have split from ours, that are weakly interacting with the ...
3
votes
1answer
67 views

What does “measurement” mean? Can a quantum particle measure another quantum particle? If not, what is a classical particle?

Say there are two particles in the x axis. Initially, with high probability one staying at $x=-1$ and going to the right, and the other $x=1$ going to the left. Will they collapse when both arriving ...
0
votes
3answers
104 views

What are some of the explanations as to why the wave function of electrons collapses when interacting with an observer?

What are some of the explanations as to why the wave function of electrons collapses when interacting with an observer? Is there a specific reason why the wave function collapses, what are some of the ...
0
votes
1answer
106 views

Mathematical description of a scalar field $\phi(x^{\mu})$

A quantum particle that has no spin, no charge, no interaction can be 'modelled' by $\phi(x^{\mu})$. This is a particle that moves freely; random one could say as well. In classical mechanics if we ...
0
votes
0answers
18 views

Seeking book on Quantum Mechanics and Logical Positivism

I'm looking for a book on Quantum Mechanics and the philosophy of science I had in college I believe it was called either Quantum Mechanics or Quantum Theory. In my hazy recollection, the author's ...
7
votes
8answers
2k views

Does the particle interfere with itself, or the observer?

In the double slit experiment, the observer doesn't know which slit the photon went through so the wavefunction is modelled as going through both slits at once and thus there's interference on the ...
0
votes
0answers
21 views

Are (super)determinism and many-worlds compatible? (For past/future prediction purposes)

I recently finished the TV show Devs, whose core premise was the use of superdeterminism, and a powerful quantum computer, to simulate (and view) the past and future. Another important plot point was ...
7
votes
4answers
268 views

Interpretation of Hilbert space in the Wightman Axioms for QFT

My confusion is about the different Hilbert spaces we meet in QFT. In a first introduction to QFT, the Hilbert space is often taken to consist of wavefunctionals on classical fields on $\mathbb{R}^3$. ...
2
votes
5answers
268 views

Is the Uncertainty Principle a mathematical consequence or a physical consequence or both? [duplicate]

I am currently exploring the mathematical structure of Quantum Mechanics on an introductory level. A couple of books and online sources (including this website) stated how the Uncertainty Principle is ...
3
votes
1answer
137 views

Published claimed falsifications of objective collapse theories

My main source of information about objective collapse theories is this review article by Bassi et al. There seem to be some problems with the theory that its practitioners readily admit to, such as ...
1
vote
1answer
42 views

Isn't the disturbance in quantum field an interpretation of quantum wave function?

In quantum mechanics, a particle is neither a wave nor a particle but is described by a wave function which does not have a physical interpretation. But in quantum field theory, a particle is a ...
0
votes
1answer
52 views

Are density states more fundamental than wavefunctions? [duplicate]

Some interpretations, like the many-worlds interpretation, treat the wavefunction (modulo an overall phase factor) as objective and fundamental. But consider the following example for a qubit: a ...
0
votes
1answer
77 views

Why does the many-worlds theory assume that the wave function is all there is?

Many-worlds interpretation says that the wave functions is all there is. And that the entire universe has only one wave function. But quantum mechanics does not fully reconcile with gravity and there ...
0
votes
0answers
35 views

How does the apparatus in QM cause the interruption of the interference pattern in the Pilot-Wave theory?

In the wikipedia page, it is written that the apparent collapse of the wave function in the Pilot-Wave theory happens because "the environment registering the detection effectively separates the ...
0
votes
0answers
39 views

Many Worlds: What happens to the mass?

This question answers the conservation of energy in many worlds by stating that the overall energy of the system is still conserved by adding up the overall probabilities of and energies of the ...
1
vote
2answers
62 views

Would the existence of a universal wave function automatically mean the Many Worlds Interpretation?

If the Universal Wave Function definitely existed, would that mean the Many-Worlds Interpretation was automatically true or would it only imply that?
1
vote
1answer
63 views

What is the meaning of Schrodinger equation solution for bound state of delta potential well?

Let's assume that we have delta potential well with $V = -\lambda\delta(x)$, where $\lambda >0$. Now if we solve Schrodinger equation, we get one eigenvalue $E_b=-\frac{m\lambda^2}{\hbar^2}$ with ...
1
vote
2answers
40 views

On particle diffraction and its relation to the statistical interpretation of the wave function

Particles can be diffracted due to their quantum nature and that is understood by their wave-like behavior. Clearly seen in e.g. plane wave solutions of the Schrodinger equation or a superposition of ...
1
vote
1answer
38 views

Interpretation of probability current density of hydrogen atom wave function

I'm trying to understand the physical interpretation of the value of the probability current density of an electron in a hydrogen atom: $$j_r=0$$$$j_{\theta}=0$$ $$j_{\phi}=\frac{h}{rsin\theta}|\psi_{...
1
vote
1answer
62 views

Inverse of Wave Reduction

Let's consider a system of three apparatuses. Sequentially these act as A device that measures momentum of an electron Parallel plates where electric field between them changes randomly. Same device ...
1
vote
0answers
35 views

Does QM talk about reality in itself or our observation of it? [closed]

I am not a physicist and I've recently started watching introductory lectures on QM on youtube (MIT, Stanford) and reading the Feynman lectures. I have a high-school level knowledge of Math so I'm not ...
1
vote
2answers
730 views

Schrodinger's Cat Logical Connective

I have heard a lot about Schrodinger's cat. Let's suppose you have a cat with a flask of poison and a radioactive source in a sealed box. The box also has a Geiger counter, if it detects ...
1
vote
1answer
82 views

Resolving the measurement problem with mathematical theorems? [closed]

The key debate, around the measurement problem is whether collapse should be interpreted as a physical process(Bohmian Mechanics) or as an immaterial process(e.g. Copenhagen Interpretation, ...
0
votes
1answer
80 views

Does the collapse of a state need to be necessarily included within the set of postulates of quantum mechanics?

When an operator is measured on a quantum state of a system, the state collapses into an eigenstate of the operator being measured. Should something of this sort be necessarily included within the ...
3
votes
4answers
385 views

What is a physical example of an observable with degenerate eigenvalues? [closed]

If eigenvalues of an observable have the physical meaning of a possible result after a measurement, what's the interpretation of degenerate eigenvalues, and what is an example of such an observable?
0
votes
0answers
23 views

Quantum Bayesianism and predictions

My question is about the fact that in QBism every physicist has different subjective prior probabilities but I am not sure if the reach the same predictions at the end as occurs for standard ...
1
vote
2answers
94 views

Quantum Bayesianism and the Copenhagen interpretation

Is Quantum Bayesianism (QBism) preferable than the Copenhagen interpretation of QM?
0
votes
2answers
97 views

What is the definition of a 'branch' in the many-worlds interpretation (MWI) of quantum mechanics?

In my rudimentary understanding of the many-worlds interpretation of quantum mechanics, one posits the existence of a universal wave function - the state of the entire universe - wherein the various ...
1
vote
0answers
30 views

Why would the classical (local) correlation in Bell's experiment rule out the cosine of the angle?

This question expands on a specific detail of this previous question: Why would classical correlation in Bell's experiment be a linear function of angle? I would have commented on/answered that ...
-1
votes
1answer
48 views

Does the Many worlds interpretation of quantum mechanics imply the existence of all conceivable worlds? [closed]

what I mean by this is, does every universe conceivable exist? would any universe i think of exist? could there be a universe of nothingness? are there universes of TV shows? are there universes with ...
-1
votes
2answers
48 views

If you were a unentangled observer, would you see the correct state of Schrödinger's cat?

If you were able to peer into the box without opening it and without interacting with the wave function, I would think that you can see the true state of the cat. Therefore, I assume the cat is at a ...
0
votes
0answers
110 views

How to operationally realize the following type of equations of motion?

It is well known that for a free particle, described by $H=\hat{p}^2/2m$, $\hat{p}_{x}(t)=$ constant (similarly for other components of momentum). Meanwhile, $\hat{x}(t)$ is not a constant, being ...
37
votes
4answers
4k views

How does many worlds interpretation work for non-50/50 probabilities?

The many-worlds interpretation of quantum mechanics has always been explained to me at a high level using examples of binary events (e.g. atom either did or did not decay at any given moment in time), ...
1
vote
1answer
65 views

Doesn't the Many Worlds interpretation of Quantum Mechanics rail to remove randomness?

In the Copenhagen Interpretation, the observed state of a particle is random. In the Many Worlds interpretation, the all possible observed state of a particle are true, an the universe "splits". But ...
0
votes
1answer
64 views

What is a good technical book to start learning Many worlds interpretation?

Good books exist on quantum mechanics emphasizing on the Copenhagen Interpretation.What are some good "technical" books on Everettian Many world interpretation of quantum mechanics? I emphasize on the ...
0
votes
1answer
178 views

What happens to the Universe if a quantum coin in a black box is secretly flipped for zillions times?

First, let us using an IBM quantum processor (QP) to run the following simple quantum circuit: The IBM $U_3 (\pi/3,0,0) $ gate transforms the initial state $q[0] = \vert0\rangle$ to a biased quantum ...
1
vote
0answers
86 views

How does virtual photon exchange lead to the attraction of opposite charges?

This wonderful page in the physics FAQ, from 1994, by Matt McIrvin http://math.ucr.edu/home/baez/physics/Quantum/virtual_particles.html explains how the exchange of virtual photons leads to ...
0
votes
1answer
89 views

Everett's interpretation of QM - does the world actually branch, physically?

Under Everett's interpretation I understand the key notion is that every quantum possibility is physically realized in its own universe, such that any one universe only contains any one physical ...
0
votes
1answer
33 views

Does the many worlds interpretation require a 100% spin up branch?

In his Q&A after his Brief History of Quantum Mechanics talk Sean Caroll mentioned that when writing his book he made 50 quantum spin measurements for an example. He admitted that in some universe ...

1
2 3 4 5
15