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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 does the “many worlds” interpretation follow from the “universal wavefunction” idea?

So, I took this class some time ago where we discussed Hugh Everett's approach to QM. The premise seemed very logical to me: Isolated systems evolve according to the Schrödinger Equation. Of course ...
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Justification for “which path” inference in Hardy's paradox?

I'm going over Hardy's paradox again recently and whenever I try to think about it I always get confused with the classical part of the analysis. Just as a brief summary, the setup of the paradox is ...
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Why are observables hermitian operators in the Everett interpretation?

Observables correspond to hermitian operators on the quantum state. But in the Everett interpretation, the wave function doesn’t collapse since we consider the entire universe as a single quantum ...
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2answers
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How does the Many Worlds Interpretation define probability? [on hold]

I'm not asking for any derivation. What is probability related to in the MWI? Is related to the fraction of observers that see various outcomes? Or something more objective?
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Accessible resources for learning Bohmian mechanics? (Undergrad)

I am an undergraudate physics and math major. For context, I've taken senior level quantum 1 as well as real and complex analysis. I'd be really interested in focusing on understanding the ...
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Why do we need the third axiom of QM to explain the wave function collapse? Why don't we use the decoherence process as an axiom?

I've always seen the standard interpretation and axioms of QM as in some way tricky on a philosophical level. They state the collapse of the wave function is caused by the measurement. 3.b If $A$ ...
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Is the Everettian interpretation the only 'realist' interpretation which has been actively researched for relativistic quantum theories? [closed]

I take it that quantum interpretations can be roughly classified into realist and instrumentalist interpretations. In the former category we have the De Broglie-Bohm interpretation, Everettian ...
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Does the Copenhagen interpretation really predict that Schrödinger's cat is both alive and dead?

Accoring to the Wikipedia article Schrödinger's cat, the answer is yes. I really don't think so. I don't think Schrödinger's cat is a good example because in fact, it's not the case that it will with ...
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Interpertation of the Heisenberg Uncertainty principle [duplicate]

As someone who's primary study is mathematics, I understand that the Uncertainty Principle is a result of position and momentum forming a Fourier pair. By this I mean one is related to the Fourier ...
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1answer
103 views

How do we interpret the many-worlds interpretation in daily life?

Of course one can say it is futile to reason about that. But if one does could perhaps reveal a wrong understanding of the MWI. Or it could clarfy how far one can extend this interpretation. Sean ...
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Does our planet's inorganic period negate the concept of creation through observation?

How can our physical world (only) manifest itself to us through observation when we know that our planet experienced a long inorganic phase that predated organic evolution by millions of years? In ...
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Quantum mechanics in terms of density operators as the fundamental object? [duplicate]

So I've done a two courses in undergrad quantum mechanics, the first began with wave mechanics and then went on to bras and kets, the second course went more into detail regarding bras, kets, hilbert ...
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What if we didn't know if particle is observed in double-slit experiment? [duplicate]

The famous double slit experiment shows how light behave like a wave when sensors near one slit are on and recording vs not recording. I didn't find a lot of details, but especially given the case ...
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1answer
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Information interpretations of QM [closed]

There are now several good books on QM interpretations, some popular, some advanced-popular. I've read a couple. At best, they mention information-theory interpretation, but without explaining how ...
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2answers
123 views

Does Bohmian mechanics really solve the measurement problem?

I'm working a lot on Bohmian mechanics related theories and just realised something that had escaped me until now but actually seems to throw a wrench in the core idea of the theory. I tried to ...
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What are good books to study the basics of Local Realism?

I am trying to have a general understanding of the concepts of Local Realist theories and hidden variable models. I do not need a detailed developement of one of these theories, but only a general ...
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33 views

Does anyone (intend to) work on free-orbit experiment with laser interferometry X-rays (FELIX)?

As the title says, is the FELIX experiment intended to be conducted in the foreseeable future? https://en.wikipedia.org/wiki/Free-orbit_experiment_with_laser_interferometry_X-rays
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Significance of cube factory paradox

I am reading a book titled QBism, a description of the Bayesian interpretation of Quantum mechanics, The author describes the “... baffling cube factory paradox...”. A factory makes perfect cubes with ...
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1answer
81 views

Comparing the Madelung and Groenewold-Moyal pictures of quantum mechanics

We can consider a dynamical theory to be a "transport theory" if it can be described entirely by a series of continuity equations of the form: $$\frac{\partial \rho}{\partial t} + \nabla \cdot \left({...
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The role of the “observer” in quantum theory?

I've been reading about different ideas of getting the observer out of quantum theory. One Sean Carroll seems to like is Everett's many worlds concept. I had a thought that I need someone here to ...
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1answer
45 views

Connection between theory of superconductivity and Bohmian mechanics

I stumbled upon an interesting chapter of Feynman Lectures about Superconductivity and was surprised to see that the equations of motion of the superconducting electron fluid (21.38 and 21.39) hold a ...
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1answer
57 views

Is electron/photon wave or particle in Feynman sum over histories formulation?

In the famous double slit experiment, a photon ( say) can behave as wave or particle depending on whether there is ( or how) an outside observer measuring the experiment. Copenhagen interpretation ...
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Spekken toy model: measurement of spin in any direction

Spekkens' toy model [1] can handle the measurement of a spin 1/2 along the directions $x$, $y$ and $z$. Unless I am missing something, it can't handle measurement in any direction. Would there be a ...
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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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Is the Many-Worlds Interpretation consistent with our best understanding of time? [closed]

Einstein's theory of relativity implies a B-theory of time. Deterministic interpretations of quantum mechanics such as the Many-Worlds would seem to be consistent with the B-theory. Regardless of ...
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2answers
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Does the de Broglie-Bohm pilot wave theory make any new predictions?

I find the de Broglie-Bohm pilot wave theory interesting but what I still feel missing in the descriptions I could find so far is that it reformulates what we already know but nobody speaks of new ...
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Causal explanation of Vaidman's group “Asking photons where they have been” experiment?

There is this surprising "Asking photons where they have been" PRL 2013 article about experiment where they are able to "ask photons" which mirrors they have visited: by vibrating each mirror with ...
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Does the Frauchiger-Renner no-go theorem prove all interpretations other than Many Worlds are incorrect? [closed]

I haven't seen this questions asked here before, I used the search function so if it has been asked, then it didn't show up. I am asking in reference to this paper that was posted to the arXiv in ...
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Is zitterbewegung physical or not?

It appears that zitterbewegung, a frequency associated with the total energy of a particle or system, is widely considered to be an unphysical quantity (e.g., Kobakhidze et.al.), @Lubos Motl, McMillan)...
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1answer
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Particles trajectories in Stern-Gerlach experiment

I red this sentence on "D.J. Griffiths, Introduction to Quantum Mechanics" talking about the using of heavy particles for the experiment. "...heavy so we can construct localized wave packets and ...
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2answers
107 views

How to deduce quantum non-locality from indeterminism?

In the paper ''Quantum non-locality as an axiom'' (Popescu, S. & Rohrlich, D. Found Phys (1994) 24: 379. https://doi.org/10.1007/BF02058098), it is stated that the conventional formalism of ...
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Which experiment clearly shows us that Heisenberg Uncertainty Principle is ontological and not epistemological?

I have heard that the Heisenberg Uncertainty Principle(HUP) is not because of our limitations in measuring and the apparatus used but instead because of the very way things are I searched online in ...
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Are properties such as locality and realism properties of all theories, some theories, or interpretations of theories?

I have a strong intuitive feeling, based for example on the Bothe-Geiger experiment, that quantum mechanics is nonlocal. But intelligent people who have thought about these things make claims such as ...
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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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What determines the determinism of observables?

It is well known that there exists certain class of physical observables like momentum and position which are common to both classical and quantum mechanics, and has different 'kinds of predictability'...
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Are the different quantum interpretations mere differences in Semantics?

Are the different interpretations of quantum mechanics mere semantic differences?(since almost all the interpretations share the same mathematical formalism , except for the collapse models). Does the ...
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157 views

Single slit experiment and the uncertainty principle - contradiction?

I have read for example here that the single slit experiment can be seen as a visualisation(?) of Heisenberg's Uncertainty principle. Basically, the photons passing through the slit are given a fixed ...
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From locality to deterministic hidden variables

According to this link here Bell said: "My own first paper on this subject ... starts with a summary of the EPR argument from locality to deterministic hidden variables. But the commentators have ...
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How are probabilities “physically real”?

I see several related questions, mostly taking the standard position/interpretation that complex-valued amplitudes aren't "physically real" (though their imaginary components do participate in ...
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The wave function of the photon and electron are probability waves, does this mean the Maxwell are some time correct some time wrong? [closed]

The wave is probability wave, it is seams that the wave function some time is correct, the energy is sent out. Some time it is wrong the energy is not sent out. Hence we can obtained the conclusion ...
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Is the Copenhagen interpretation falsifiable?

According to the Copenhagen interpretation, physical systems generally do not have definite properties prior to being measured. The Schrödinger's cat is both dead and alive, until an observation is ...
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106 views

Does the many worlds interpretation still require retro-causality?

The delayed choice quantum eraser experiment seems to require retro-causality: the which-path information is deleted after the particles arrive at the detection screen. But does the many worlds ...
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Are quantum mechanics non-deterministic? [duplicate]

I am often being told that quantum mechanics are deterministic, but according to the Copenhagen interpretation, when the wave function collapses, the particle randomly chooses its state and I can't ...
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In the “many worlds” interpretation does every possible past which leads to the present exist

Does the many worlds interpretation of quantum physics apply only to the future, or does it apply equally to the past? Rather than a cat in a box, imagine a dinosaur in a box 65 million years ago. In ...
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Has quantum “solipsism” been addressed in the MWI literature?

There are similar-sounding questions in philosophy SE (see here and here), but they are rightly ignored for being too vague. I will try to be more precise. There is a particle in state $|\psi_0\...
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Proving which Quantum Mechanics interpretation is correct [duplicate]

Let's assume that the existence of gravitons is theoretically proven or they are detected by LHC could one interpretaion be proven correct?
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148 views

Quantum mechanics interpretations [closed]

Let's assume that the existance of the graviton is proved theoretically or it is detected by the LHC and there is found a way for Pilot Wave Theory for it to account to special relativity via the ...
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Couder's walking droplets - what are issues of using its intuitions to interpret quantum analogoues?

There are these popular experiments with droplets having wave-particle duality, e.g. here is Veritasium video with 2.3M views, great webpage with materials and videos, a lecture by Couder. Among ...
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Quantum foundations and QM interpretation - reading material

I recently wrote an answer on a question and I would infer from the responses that there is not widespread awareness of the context of the development of QM and its various interpretations. Instead, ...
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Understanding Bell's Inequality in Sakurai's text

In Sakurai's book Modern Quantum Mechanics(2nd edition) he states the following in the section on Einstein's Locality Principle and Bell's Inequality (page 241): "We derive Bell's inequality within ...