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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Identical particles in Bohmian quantum mechanics

Particles can be distinguished by their trajectories in Bohmian quantum mechanics and there is no natural reason for imposing symmetrization (or anti-symmetrization) of the wave function of the ...
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Am I in a superposition?

Someone looks at me. Now, they know my position and my momentum, with some uncertainty. Therefore, they haven't measured either my position nor my momentum, since neither is known perfectly. They ...
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What is the Frauchiger-Renner experiment? Can it be described more simply?

Several question on the Physics SE have mentioned a 2018 paper by D. Frauchiger and R. Renner with the title "Quantum theory cannot consistently describe the use of itself" (doi, arXiv). ...
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System in Superposition, Subsystem in Eigenstate: are the variables real/determined or non-real/undeterminate?

As far as I can tell, this is all textbook Quantum Mechanics, no interpretations were assumed. Isolated system $S$ is divided into 2 isolated, separable sub-systems: $Particle$ and $Observer$. $...
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Continuous Collapse Interpretation

Suppose we interpret quantum mechanics to mean that the collapse randomly happens at every single moment. Wouldn't this be identical to the many worlds interpretation except much less objectional ...
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Is there a way to measure the branch production rate of a system in the many worlds interpretation?

Is there a way to measure the branch production rate of a system in the many worlds interpretation? My understanding is that chaotic systems with sensitive dependence on initial conditions is likely ...
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MWI and each path in a Feynman Integral [duplicate]

I have been looking into the MWI of QM, and I wonder if it implies that we should consider each trajectory in a Feynman Path integral as being "equally real", and that we simply inhabit the ...
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Universal Path Integral & the Many-worlds interpretation (MWI)

I was wondering if the universal wave function can be thought of using a path integral approach? And if so, does each path correspond to a "branch" of the MWI of QM? Or have I misunderstood ...
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Are Superdeterminism and Many Worlds compatible quantum interpretations?

Pretty much as my title says... are Superdeterminism and Many Worlds compatible quantum interpretations? It seems to me that they might be compatible, or close to it, maybe even the stronger statement ...
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Clarification on the Premises of the Einstein-Podolsky-Rosen Argument

In their famous EPR paper, Einstein, Podolsky and Rosen argue that quantum mechanics does not provide a complete description of physical reality. To do this, they make two key assumptions: in a ...
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Pauli exclusion principle in case of electron-positron anhillation?

Pauli exclusion principle says that no two particles can occupy a single Quantum state and that prevents electron from falling into the nucleus. But then, what about electron-positron annihilation, ...
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How are can there be initial conditions in Bohmian mechanics that disobey the Born rule if Gleason's theorem is true?

Gleason's theorem constrains the possible measures that are allowed on Hilbert spaces of dimension $\ge 3$. It is often said that Gleason's theorem essentially says that the Born rule is the ...
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Do I understand De Broglie–Bohm theory correctly?

In the interpretation of quantum mechanics developed by David Bohm (De Broglie–Bohm theory), the wave function is considered as a real-life physical field that evolves according to the Schrödinger ...
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Are there any event (whether micro or macro) with only one possible outcome? [closed]

I'm honestly confused with how quantum mechanics works. Does the double-slit experiment indicate all events have more than one possible outcome? If that's the case, does a single-slit that shows no ...
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How is it possible for Born's interpretation of the wave function to be published after Schrödinger published his equation?

If I am right Born published his interpretation of the wave function after Schrodinger published his wave equation. However, according to my QM textbook, all the expected values of quantities (like ...
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The Copenhagen Interpretation

What are the actual papers in which Bohr, Born, and others proposed the Copenhagen interpretation? I know that Bohr himself didn't use the term, but I assume that he outlined the way of understanding ...
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Can experiments show if there are real non-local hidden variables?

Local hidden variables are ruled out by experiment (Bell). Non-local ones are not excluded though. Are there experiments thinkable to discern if they really exist or if reality is intrinsically ...
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Quantum Zeno Effect and Many Worlds Interpretation (Plus Quantum Eraser)

What's the Many-Worlds interpretation of the Quantum Zeno effect and does its interpretation somehow relate to the Many-Worlds interpretation of the quantum eraser experiment? If so, how? I know this ...
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Resources for studying quantum metrology

I want to learn about quantum metrology topics like von-Neumann hamiltonian, ABL rule etc., typical case studies of interpretation of measurement, quantum contextuality etc., discussion on what is ...
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Is the Many-Worlds Interpretation of Quantum Mechanics Unitary?

Proponents of the Many Worlds interpretation of quantum mechanics claim that according to this interpretation, the quantum state of the universe evolves unitarily, according to the Schrödinger ...
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Did either Bohr or Heisenberg specifically state in writing, or speech, an interpretation of Schrodinger's Cat directly

If we take the Copenhagen Interpretation to mean "what Bohr and/or Heisenberg think," then I would like to know if either one of them said, in so many words, "Yes. The cat is in fact ...
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Why are wavefunction collapses instantaneous?

From my understanding of quantum mechanics, when a wavefunction is observed, it collapses into a single state instantaneously (or at least in the length of a Planck time.) Is there a reason it has to ...
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Many Worlds interpretation of QM

In the many worlds interpretation of QM why does the universe splits to multiple universes after a measurement and not all the time?
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Given many-world interpretations, can we send a message to one of them? [closed]

We have a sequence of 104 (13 * 8) independent boxes with 0 and 1 quantum states superimposed in each. We want to send 'Hello, world!' message to 1 world out of the many. So we say, if after measuring ...
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Explain Elitzur-Vaidman in MWI

What happens in the experiment according to MWI? When do world splits happen in a Mach-Zender Interferometer in the many world interpretation with a dud bomb? At the first mirror? Then how come the ...
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What is the physical interpretation of the wave function in the Many Worlds Interpretation of Quantum Mechanics?

In the Copenhagen Interpretation of Quantum Mechanics (QM), the mod-square of the wave function gives us the Probability Density Function (PDF) of the quantum object. Is there any such meaning for the ...
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Does this video from Veritasium imply that the uncertainty principle is false?

The video in reference : Is This What Quantum Mechanics Looks Like? At 4:47 to 5:10, he shows a situation meant to be an analogy to a quantum particle going through the double slit experiment and ...
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Causality for Many-Worlds interpretation

My (superficial) understanding of the Many-Worlds interpretation of QM is that it accounts somewhat for the fundamentally probabilistic nature of QM... but to my mind it doesn't seem to capture non-...
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Does Grete Hermann's thought experiment concerning the relative nature of QM stand valid?

In the 1930's, Grete Hermann argued of the relative nature of quantum systems. In her words (after translation), Quantum-mechanical characterization is not, like the classical one, attributed to the ...
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Copenhagen interpetation applied to a video recording [duplicate]

I always get a little confused when it comes to the Copenhagen interpretation, and especially the fact that (for instance as per this article https://medium.com/science-and-philosophy/the-copenhagen-...
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What is the ontological status of gauge fields/virtual particles/electron radiation in Dirac sea model of Bohmian QFT?

I have been reading about this model - it is a model without actual particle creation or annihilation, particles move deterministically according to Bohm's law, the Dirac sea is used to explain away ...
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Heisenberg’s Formulation of Quantum Mechanics and Particle Trajectories [duplicate]

In the article, under the history section, Heisenberg recounts a discussion with Einstein regarding Heisenberg’s matrix mechanics: “ He pointed out to me that in my mathematical description the notion ...
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In the many-worlds interpretation (MWI) - is all matter duplicated at every split?

This might be a completely stupid question but I would like to understand: In the many-worlds interpretation (MWI) if the universe splits at some point (wave function collapse), does it mean that all ...
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Why does the imparting of momentum to a mirror not count as "observation" in Wheeler's delayed choice experiment?

Presumably light pressure would change the momentum of the beam-splitting mirrors in the interferometer version of Wheeler's delayed choice experiment. And it's not until the photon encounters the ...
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2 votes
2 answers
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Is the wave-function collapse real or an interpretation? [closed]

Consider the double slit experiment in which the position of the particle is in a superposition of the 'eigenfunctions' of the position operator before they reach the detector. This process is ...
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Is Laplace’s demon compatible with other interpretations of quantum mechanics?

We know that Laplace’s demon is incompatible with the Copenhagen interpretation of quantum mechanics, because the Copenhagen interpretation is inherently non-deterministic. But there are other ...
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Hadamard Gate: randomness and hidden variables in quantum systems

The nicest exposition I have found about the Hadamard gate in quantum computing is as follows: So, the Hadamard gate essentially takes a known input (black ball or white ball in this case) and ...
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In Bell's experiment, can "knowing the future" be that "hidden variable"?

(Sorry if I'm spamming your board with Popular Science speculations, but I just thought this could be an interesting thought experiment). There are quite a few videos on youtube about Bell's ...
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Fabric of reality shadow photon partitioned off into parallel universes among themselves?

In fabric of reality interpretation of QM chapter 2 how does David Deutsch conclude that the "shadow photons" in the one-particle-at-a-time double slit experiments are themselves ...
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-2 votes
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Is the position of a quantum particle truly random or does it depends upon uncontrollable factors? [duplicate]

When you roll a dice or flip a coin, the result depends upon the way you roll/flip it, where it lands, etc. So practically, the dice or coin are not actually random. Does this apply to quantum ...
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Superposition of particle positions

There is an interesting analogy given in this video (beginning at 12:20 -- link jumps directly to this timestamp) on Quantum Field Theory which I am trying to reconcile with one or more ...
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What measurable quantity is associated with parity?

In quantum mechanics, we learn that for any Hamiltonian with a symmetry, there exists a unitary operator associated with that symmetry. Consider the parity operator which is defined by its operation ...
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I'm not seeing any measurement/wave function collapse issue in quantum mechanics

The information about a particle is contained in a vector of unit-norm called the wave function. One postulates says that this wave function is supposed to evolve with time as the particle interacts ...
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A Different Type of a "Measurement" Process?

In my understanding, a measurement process for the measurement of an observable $\hat{A}=\sum_i a_i\vert a_i\rangle\langle a_i\vert$ over a system that lives in $\mathcal{H}_1$ (when unentangled) by a ...
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In objective collapse theory, do large objects constantly collapse?

In objective collapse theory, do large objects constantly collapse? So I understood it like this: Wave collapses into one concentrated point, Wave spreads out, Wave collapses into one concentrated ...
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Does the Many Worlds Interpretation make any distinction between entangling processes and measurement?

Suppose I have a qubit in the state $\alpha|0\rangle + \beta|1\rangle$. In the many worlds/relative state formulation of QM, if I measure this qubit with a measuring device in some initial state $|\...
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1 answer
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How does the interpretation of consistent histories fit with the path integral?

The interpretation of consistent histories states that different histories of a quantum particle have different probabilities, but in fact only one of them happens. If we take the trajectory of the ...
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1 vote
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MWI and quantum probability

One thing that I cannot wrap my head around, and which never seems to be addressed in the videos and articles I've read about the Many Worlds Interpretation, is how "branching" is supposed ...
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Can we describe a relativistic quantum field theory in a "particles with position" framework _if_ we constain it somehow?

EDIT: I'm rewriting this with a different mathematical formalism that I think may be more appropriate and hopefully this will be clearer. Yes, another conceptual question regarding quantum theory. It ...
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2 votes
2 answers
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Does quantum mechanics tell us when the next measurement will occur?

In many interpretations of quantum mechanics, the result of a measurement is regarded as non-deterministic. However, my question is: is the time at which a measurement occurs deterministic? To be ...
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