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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Are their known paradoxes regarding a detector that is entangled with a particle it detects?

Is it possible to design a system where a detector is entangled with the particle state it detects (before it is detected), and to create a paradox from this? Upon observance of a state by the ...
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Physical electron mass: renormalized VS running VS pole of propagator

This is a follow-up to the question: About the physical, measurable coupling constants, after renormalization In QFT, we have the bare mass, renormalized mass, physical mass (which corresponds to a ...
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What does it mean for the wave function to be “objectively real” in many-worlds interpretation?

The wiki on many-worlds calls the wave function "objectively real". Is this to mean physically real? If so, what kind of a physical object is it? And why does many-worlds require the wave ...
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About the physical, measurable coupling constants, after renormalization

I am going through the basics of renormalization in QFT from Schwartz's book and I'm confused about what is the measurable coupling constant. In the $\phi^4$ theory, to compute this $2\rightarrow2$ ...
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Is there any prevalent philosophy regarding how many “initial worlds” exist in Everettian style “Many Worlds“ theories?

If I understand the general concept correctly, in the context of the Everettian “Many-Worlds interpretation” of QM, as opposed to seeing the wavefunction of some quantum process collapse and result in ...
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The Dual Nature of Dual Nature [duplicate]

When we say that light behaves as a particle and as a wave, we say that light is an electromagnetic wave, and it's a photon. Both EM waves and photons have physical definition. On the contrary an ...
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What is the meaning of probabilities in quantum mechanics?

In quantum mechanics, probabilities are associated with the detection of a physical event by a macroscopic device, or are events at the microscopic level also probabilistic? For example, the ...
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1answer
102 views

Are interpretations of quantum mechanics useful/necessary? [closed]

Is there any benefit for someone to learn about the interpretations of QM if their only goal is practical, for example to program a quantum computer or even just to get a good grade on a test? Suppose ...
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How to imagine wavefunction branching?

This is a question particularly geared toward the Many Worlds interpretation, but I think it could be translated to other approaches as well. I am not sure I understand exactly what sort of events ...
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When people say Bell's theorem implies either non-local realism or local non-realism, what do they mean precisely by “realism”?

From the EPR article: "If, without in any way disturbing a system, we can predict with certainty (i.e., with probability equal to unity) the value of a physical quantity, then there exists an ...
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Is the Copenhagen interpretation still the most widely accepted position?

In my undergraduate Quantum Mechanics textbook (Griffiths), of the Copenhagen interpretation it says "Among physicists it has always been the most widely accepted position". I'm currently ...
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Are Bohm's later books worth reading? [closed]

I mostly see Bohm's later books such as Wholeness and the implicate order and The Undivided Universe quoted in discussions of pseudoscience and quantum mysticism. Do they offer any useful insight into ...
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Measurement in 't Hooft Cellular Automation Interpretation (CAI)

In the 't Hooft Cellular Automation Interpretation it is declared, that for a system described by some template state $\lvert \psi \rangle$ and for any ontological measure outcome $\langle a \rvert$ ...
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Why $\psi(x)$ needs to be square integrable?

The question might be due to some incompleteness. A state vector ket, $|\psi\rangle$ can be expanded in terms of position basis as, $$|\psi\rangle = \int |x\rangle \langle x|\psi\rangle dx$$ Now if I ...
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Why is wave function collapse mysterious?

There are lots of questions and answers on this site about wave function collapse (for example, How does a Wavefunction collapse?, Why does a wavefunction collapse when observation takes place?, How ...
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Problem understanding Many-Worlds Theory [duplicate]

If Everett's Many-Worlds Theory (MWT) was true, wouldn´t it mean, that each split into two (or n) worlds, would correspond to 2 (or n) equally likely probable outcomes of the currently considered wave ...
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Is the Pusey-Barrett-Rudolph (PBR) theorem only applicable in two dimensions?

In the Pusey-Barrett-Rudolph (PBR) paper, https://arxiv.org/abs/1111.3328 it is shown that two non-colinear pure states $|\psi_0\rangle$ and $|\psi_1\rangle$ cannot have overlapping ontic supports (...
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Is the “preferred basis problem” about why things entangle in specific ways?

I know there are various definitions of the "preferred basis problem." I'm trying to understand what Wikipedia is saying here. ... a quantum state can equally well be described (e.g.) as ...
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How to envision particles in superposition in Many Worlds presplitting

Should particles in superposition before quantum decoherence (many worlds) be envisioned in the same exact way as they are envisioned before wave function collapse (Copenhagen)? Clearly, the particle ...
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3answers
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For many minds interpretation, is there one single physical world or many physical world?

https://sites.rutgers.edu/barry-loewer/wp-content/uploads/sites/195/2019/06/Albert-Loewer-Interpreting-the-Many-Worlds-Interpretation.pdf According to the paper above, it seems to suggest one single ...
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Implications of Wilczek's experimental verification of entangled histories

I've been wondering about claims made stemming from 2015 experiments demonstrating entanglement of mutually exclusive temporal histories in a physical system. Frank Wilczek, who conducted the ...
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How is the non-local nature of quantum entanglement explained?

From what I understand, Einstein tried to introduce real but hidden variables to remove the apparent non-local nature of quantum entanglement, but Bell's inequality showed local realism isn't possible....
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How does Oxygen influence band gap in Silicon Suboxides?

I just started to study about Mott’s Formalism and as I was going through some prerequisite material for Variable-Range Hopping Conduction I read the following paragraph, " Theories on non-...
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The structure of Worlds in Many Worlds theory

I've read David Deutsch's article where he explains - in terms of information flows - how different Worlds can be located in the same 3D space (as we perceive it) while do not interact with each other....
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Could a form of (temporally-limited non-superdeterministic) strong determinism resolve retrocausality in quantum theories?

It looks like "superdeterminism" is considered as a potential way to resolve EPR paradox/Bell's theorem/quantum theory. It seems "retrocausality" (or what could be or is called ...
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What are fundamental reasons for conservation laws in Quantum Mechanics?

Let me be a little silly and suppose that when "God" created our Universe - he had these 3 options: (Most classical): let the energy (contained in any particle = field excitation) spread ...
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Does conservation of energy across “worlds” explain probabilistic filtering of photons?

We can set up a light filter and a light source such that angling the filter may block out some/all of the light. For example, with a certain filter angle we might see that $30\%$ of the original ...
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Are there alternative but equivalent formalisms for Quantum Field Theory?

I am curious if there are any alternative formulations of QFT generally, in the same way that QM can be reformulated into different, but equivalent formulations beyond Schrodinger wave mechanics and ...
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What are the objections to stochastic quantum mechanics?

I recently discovered the stochastic interpretation of quantum mechanics, which is different from the De Broglie-Bohm theory The best article I found on it was very much a comparison of the two by ...
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What's the difference between NOON states and cat states?

I am wondering which is the exact definition of NOON states and cat states and which is the difference between them. Is one a special kind of the other?
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Wigner's friend experiment - How is there an apparent paradox?

Wigner's friend thought experiment mentions that there is an apparent paradox - 'when exactly did the collapse occur?'. Whether it occurred when the friend made the measurement, or when Wigner asked ...
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Question pertaining to the number of possible worlds in many worlds interpretation

So I’ve been reading about the many worlds interpretation of quantum mechanics, and I keep seeing that they say that all worlds would come about. In repeatedly seeing the notion of all options, I ...
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Many-world interpretation of double slit experiment

Different interpretations of young's double slit experiment is available, I read Copenhagen and Feynman's path integral interpretation of double slit experiment; former uses the idea of wave function ...
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Is my interpretation of a quantum field correct?

In classical mechanics, the phase space of a single particle is given by the position $x=x(t)$ and its momentum $p=\dot{x}(t)$. More generally, a particle is described by generalized coordinates $q$ ...
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Conway's and Kochen's SPIN axiom seems unphysical

In their "Free will theorem", Conway's and Kochen's states the "SPIN axiom": "A triple experiment for the frame (x, y, z) always yields the outcomes 1, 0, 1 in some order.&...
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Is there an experiment that verifies the quantum state collapse is a physical process or a process of reality?

Is there an experiment that verifies the quantum state collapse is a physical process or a process of reality? Or the quantum state collapse is just interpretation, but is not a physical process?
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Are there Interpretations of Classical Mechanics, Classical Electrodynamics, and/or Relativity (either Special or General)

Just like Quantum Mechanics has many interpretations (Copenhagen, Many-Worlds etc.), do any other theories in Physics have multiple interpretations? For example, does Classical Mechanics, Classical ...
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Are the paths in a Feynman path integral not observable?

The only quantity that appears after doing a Feynman path integral evaluation is the propagator which is used to compute different observables. The paths in the FPI don't appear anywhere in the ...
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What does it mean to interpret the quantum state statistically in the Pusey-Barrett-Rudolph (PBR) Theorem?

In the Pusey-Barrett-Rudolph (PBR) paper “The quantum state cannot be interpreted statistically” [arXiv:1111.3328v1, later published as Nat. Phys. 8, 475 (2012)] the following claim is made: If a ...
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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 ...
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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 ...
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Question on hidden variable theory of QM [closed]

My understanding from careful study of Bells theorem 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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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-...
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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 ...
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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 ...

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