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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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How do “many worlds” theorists explain particle double-slit interference patterns?

In the past couple of weeks I’ve re-watched Sidney Coleman’s wonderful 1994 lecture “Quantum Mechanics” in Your Face” and Sean Carroll’s 2019 Google talk “Something Deeply Hidden: Quantum Worlds & ...
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25 views

Linear Polarization of Single Photon?

I've heard it said (a while ago) that we don't usually speak of a single photon being linearly polarized or unpolarized, but rather we can speak of an ensemble of photons that are linearly polarized ...
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Many Worlds: under which conditions does the branching happen?

I am approaching Many Worlds interpretation and I have a big question that I would like to ask you: I buy the critic moved by Many Worlds supperters to Copenhagen interpretation, saying that Bohm ...
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1answer
28 views

What's the necessary and sufficient condition for the expectation value of an measurement to be constant?

For operator $A$, the famous equation from Heisenberg picture (see: Time Variation of Expectation Value ) stated that, since $$\frac{d A}{dt}=\frac{i}{\hbar}\left[H,A\right]+\left(\frac{\partial A}{\...
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What is the physical meaning of the sum of two non-commuting observables?

Scenario: ${\mathcal A}$ and ${\mathcal B}$ are two observables. Mathematically we model them by two Hermitian operators $A\colon H \to H$ and $B\colon H \to H$ on a separable Hilbert space. ...
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26 views

A small alteration to the Afshar experiment

I found a setup of Afshar experiment in Fig. 3 of this Wikipedia link. I assume that the setup shown in Fig.3 is accurate (Sorry for using Wiki as a link). https://en.wikipedia.org/wiki/...
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1answer
80 views

The “Many Worlds” description of quantum mechamics and the “Multiverse”

I see a Phys.SE question, asking if the "Many Worlds" and the "Multiverse" ideas are essentially equivalent. This question was quickly squashed with a no answer. I would like to rephrase the question. ...
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2answers
80 views

Would Occam's Razor dictate adopting the Everettian interpretation of quantum mechanics?

In quantum mechanics we have the the state of a system represented entirely by a wave function, and the equation that dictates how it will evolve, i.e. the Schrodinger equation. The Copenhagen ...
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1answer
58 views

Could brain “entanglement” explain the double slit experiment? [on hold]

I know I should abandon trying to figure out quantum experiments and simply accept the various interpretations in the physics books but please bare with me and explain why my latest idea is wrong. I ...
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3answers
36 views

Understanding quantum models

In quantum mechanics we have different models like the infinite and finite square well, potential barrier, etc. What I don't understand is how these are applicable to real life situations. For example,...
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1answer
93 views

Is Quantum Darwinism considered an interpretation of Quantum Mechanics?

I did not see Quantum Darwinism in the Wikipedia article on the interpretations of Quantum Mechanics but there is a Wikipedia article on Quantum Darwinism so this prompted my question. As for example ...
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39 views

What are the best resources to master Quantum Entanglement?

I am reading Modern Quantum Mechanics by Sakurai for my semester. I read about the Quantum Entanglement, Bell Inequality and Hidden Variables theory, EPR Paradox etc. and got fascinated. I just wanna ...
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204 views

Is the MWI symmetric in time?

Reading the blog of Sean Carroll (I recognize he isn't the only voice) has made me more sympathetic to the notion of many worlds, but reading Susskind (also not the only voice) has made me think that ...
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41 views

Quantum waves as waves of space itself?

Are there any interpretations of quantum mechanics were quantum waves are waves of space itself? I'm not talking about gravitational waves, more like pilot-wave theory. There seems to me like it would ...
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1answer
115 views

Could quantum randomness be transformed into classical, macroscale randomness?

If measurements of quantum phenomena can show results that are truly random wouldn't it be possible to establish a macroscale-dependence on such a non-statistical result and thereby introduce ...
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209 views

Is it possible to reproduce the energy spectrum of quantum chaos using classical cellular automata?

Is it possible to reproduce the energy spectrum of quantum chaos using classical cellular automata? It's hardly impressive to reproduce harmonic oscillators.
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108 views

Are wave functions built of other wave functions?

I have heard the term wave function used in a number of contexts describing both quantum objects (electrons, etc) and more macroscopic objects (atoms, birds, cats, etc). Is it correct to say a lithium ...
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108 views

A simple explanation of the Born rule?

The probability that an initial quantum state $|\psi_i\rangle$ becomes the final quantum state $|\psi_f\rangle$ is given by \begin{eqnarray} P(i \rightarrow f) &=& |\langle\psi_f|\psi_i\...
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A simple explanation of the Born rule (v.2)? [duplicate]

Please post further comments or answers to A simple explanation of the Born rule? The probability that an initial quantum state $|\psi_i\rangle$ evolves to become the final quantum state $|\psi_f\...
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26 views

Expansion of the Universe in regards to finite entropy

I believe variations of this question have been asked before, but I've been unable to put together enough of the information from previous attempts so I was hoping I could get some help. In this ...
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1answer
559 views

Is Bohmian mechanics really incompatible with relativity?

This is something I've been wondering about. For those who don't know, Bohmian mechanics is an interpretation of quantum mechanics that is in the class of what are known as "hidden variable theories", ...
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Are the multiple universes required by the MWI of quantum mechanics just other parts of our infinite universe? [duplicate]

An infinite universe would already contain every possible state the observable universe could be in, so it would also contain our observable universe with outcome A & our observable universe with ...
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Are the multiple universes required by the MWI of quantum mechanics just other parts of our infinite universe? [duplicate]

Seeing as our infinite universe would already contain every possible state the observable universe could be in, then it would already contain our observable universe with outcome A & our ...
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37 views

Does Quantum Darwinism select against the Frauchiger-Renner inconsistent states?

Zurek's Quantum Darwinism is based on an environment induced superselection of pointer states, within which entanglement plays an essential role. Similar arguments can be made related to Horodecki's ...
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324 views

Does the Copenhagen interpretation (+ “quasi-classical apparatus”) allow one to bypass a derivation's objection? [closed]

Background I asked this question, where I'm thinking about this joshphysics's answer: And the gist of what I get is (from the answers and the chatroom) within interpretations of quantum mechanics ...
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1answer
94 views

Noether's Theorem and the Measurement? (In Copenhagen)

Background I'm trying to recently understand the Copenhagen interpretation. We all know due to Noether's theorem energy is translational invariance in time. However, in quantum mechanics the ...
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8answers
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Why is the application of probability in QM fundamentally different from application of probability in other areas?

Why is the application of probability in quantum mechanics (QM) fundamentally different from its application in other areas? QM applies probability according to the same probability axioms as in other ...
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1answer
143 views

How many worlds are there during branching in the many worlds interpretation?

Background and Question "Measurements are modelled as interactions between subsystems of the universe and manifest themselves as a branching of the universal state." - Wikipedia What is the ...
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48 views

Wigner's Friend in the many worlds?

Background In the thought experiment of Wigner's friend the many-worlders claim: "Everett claims to solve the Wigner's Friend paradox by only allowing a continuous unitary time evolution of the wave ...
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3answers
510 views

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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1answer
34 views

Physical meaning of whole state space for spin-one

The spin-one quantum states belong to $\mathbb{C}^3$, with a set of orthonormal bases taken as the spin component along a direction, which would correspond to the direction of the magnetic fild ...
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1answer
55 views

Is this interpretation of the Copenhagen Interpretation accurate in this book from Bruce Rosenblum and Fred Kuttner?

I'm very new on this particular subject, can anyone help me determine how accurate the interpretation of Bohr's quote is, and where is the origin of this quote?
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575 views

Is the trajectory of a quantum particle a well defined concept and how does this depend on the interpretation of quantum mechanics?

A common statement about quantum physics is that the "trajectory" of a particle is no longer a well defined concept because of the uncertainty relations for position and momentum. If one interprets ...
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327 views

Does the quantum eraser double slit experiment disprove many worlds interpretation?

The quantum eraser double slit experiment shows that interference pattern is destroyed not by interacting with the quantum particle, but rather by getting which path information. In this experiment ...
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314 views

Don't these experiments suggest that locality has to be abandoned in the quantum realm?

First a quick recap because maybe my understanding/assumptions are flawed (you can jump to the question highlighted in bold below if you like to): Bell's inequalities require that an accurate(ly ...
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23 views

Topos quantum theory and distributive logic

I am reading an introductory review on topos quantum theory https://arxiv.org/abs/1106.5660 where in the motivation part it says (emphasis is mine): As we can see the non realism of standard ...
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1answer
100 views

Can unitary probability theory (quantum mechanics) emerge from a lack of information about a deterministic process? [duplicate]

My initial question below appears to be unclear so I am rewording in more succinctly here. The pre-edit question remains below. There exists two types of probability theory: 1-norm (classic ...
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50 views

What generates physical meaning in mathematical quantum theory?

Let mathematical quantum theories be theories of Hilbert-space rays together with probability / amplitude / unitary evolution / Hermitian operator machineries. Observations essentially correspond to ...
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3answers
254 views

Einselection locality in decoherence theory

Consider two polarity-wise entangled photons A and B in an EPR experiment. The process of measuring the polarization of photon A by Alice is described by the decoherence of the 2-photons system ...
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133 views

What's the difference between the Copenhagen and many-worlds interpretations?

I don't know that much about quantum mechanics, but after reading the Wikipedia pages for the Copenhagen and many-worlds interpretations, I'm left with the impression that the two are describing the ...
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1answer
47 views

Why do we see particles in the many-worlds interpretation?

I am starting to feel like I have a decent grasp on the MWI, but a piece of it keeps bugging me. My understanding is that quantum objects are kind of spread out and wavy until something comes along ...
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76 views

Is There Already Evidence Supporting Stapp's Theory of the Causally Efficacious Human Will? [closed]

Physicists J. Acacio de Barros and Gary Oas wrote a paper titled “Can we Falsify the Consciousness-Causes-Collapse Hypothesis in Quantum Mechanics?” published in the Foundations of Physics, 47(10):...
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1answer
183 views

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 basis, which turns out to be the position-basis in most ...
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What is the interpretation of complex amplitudes in the many-worlds interpretation? [closed]

Many (popular?) accounts of MWI seems to suggest that MWI "solves everything" (including collapse), as long as you accept the infinitely branching (and co-existing) universes, etc. But I don't fully ...
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60 views

Did Wheeler propose some kind of variation of MWI where universes would have different laws of physics?

John Wheeler proposed along with Hugh Everett and Bryce DeWitt the 'Many Worlds' Interpretation of Quantum Mechanics (although he expressed some doubts about its validity) I have read, from an ...
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Are different interpretations of quantum mechanics empirically distinguishable?

Are the different interpretations of Quantum mechanics just different viewpoints of the same physical reality? Or can experiments distinguish them? Are they empirically distinguishable or not? I have ...
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8answers
2k views

Where to draw the line between quantum mechanics theory and its interpretation(s)?

I've completed a full year QM course (undergraduate level) and I am left confused on where to draw the line between quantum mechanics theory and its interpretation(s). I would personally like to stick ...
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165 views

How is it possible that consciousness-causes-collapse interpretations of QM are not falsified by the Quantum Zeno effect? [closed]

As I understand it, consciousness-causes-collapse (CCC) theories, although not very popular among physicists, have not been falsified (e.g. https://arxiv.org/abs/1609.00614). This confuses me ...
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How Many Branches Does MWI Postulate?

I'm a little unclear on what the Many Worlds Interpretation (or family of interpretations), MWI, says will happen instead of a collapse. Suppose I measure particle spin on the X-axis. The Copenhagen ...
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1answer
169 views

Does Bell's theorem imply nonlocality using a false assumption? [closed]

In https://arxiv.org/abs/1409.5158, the author concludes that Bell tests cannot refute local realism, because they employ a wrong analysis. He says: "The quantum joint prediction cannot be ...