Thought double-slit experiment

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Discussion Overview

The discussion revolves around the double-slit experiment in quantum mechanics, specifically focusing on the behavior of electrons as both particles and waves. Participants explore the implications of using single electrons in the experiment and the nature of the electron-wave and electron-matter, questioning how these concepts relate to the observed interference patterns.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants propose that in the double-slit experiment, the electron-wave divides into two wavelets when passing through the slits, while the electron-matter does not divide.
  • Others argue that the electron wave determines the probabilities of measurement outcomes, and at any point, a detector will register either a whole electron or nothing.
  • A participant questions what is actually divided in the experiment, noting their unfamiliarity with the topic.
  • It is suggested that quantum mechanics predicts probabilities based on possible paths and initial states, but does not clarify the behavior of particles between source and screen.
  • Some express uncertainty about the nature of the "something" that may divide and reunite, with no scientific consensus on what that might be.
  • Participants discuss the concept of the electron-wave, with one noting that it may be a mental picture rather than a definitive explanation within quantum mechanics.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the nature of the electron-wave or the electron-matter in the context of the double-slit experiment. Multiple competing views remain regarding the interpretation of quantum mechanics and the implications of the experiment.

Contextual Notes

There are limitations in the discussion regarding the definitions of terms like "particle" and "wave" in quantum mechanics, as well as the assumptions underlying the interpretations of the experiment. The discussion highlights the unresolved nature of these concepts and the lack of experimental evidence to clarify them.

En Joy
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In Young’s double slit experiment, if we use a single electron, then the electron-wave would divide itself into two wavelets due to two narrow slits. Similarly would the electron-matter divide itself in that experiment? If it would not, then through one slit, both the electron-wave and electron-matter would go and through one slit only electron-wave would go. But we would not see any assymmetry in interference pattern, why?
 
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The electron wave determines the probabilities of the outcomes of a measurement if one were made.
At any stage of the double slit experiment, wherever you place detectors, you will detect either one whole electron or nothing.
The probability waves will tell you what sort of interference pattern you'll see if you put enough electrons through the experiment.

The electron matter does not divide itself in the experiment.
 
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jfizzix said:
The electron matter does not divide itself in the experiment.
Then what is actually divided? ( I am new to this topic)
 
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fireflies said:
Then what is actually divided? ( I am new to this topic)

Nothing, as far as the mathematical formalism of quantum mechanics is concerned. Quantum mechanics accurately predicts the probability of the electron landing at various points on the screen based on the number of possible paths and the initial state of the electron, but it says nothing about what's going on between source and screen. Furthermore, in QM the word "particle" means something very different than the informal English meaning of the word, so you cannot trust your classical ideas about particle behavior - for example, you cannot assume that, if the particle started at point A and was later found at point B, it moved through the space between them.

You may reasonably choose to believe that something had to physically divide and reunite somewhere, but there is no scientific agreement about whether that is indeed the case, nor what that something might be, and no known experiment that could answer either question.
 
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Nugatory said:
You may reasonably choose to believe that something had to physically divide and reunite somewhere, but there is no scientific agreement about whether that is indeed the case, nor what that something might be, and no known experiment that could answer either question.

Hard thing to take. Is this "something" the electron-wave? (Like the OP mentioned)
En Joy said:
In Young’s double slit experiment, if we use a single electron, then the electron-wave would divide itself into two wavelets due to two narrow slits.

If this is so, then what is actually electron-wave? Intuitively I thought that, it is the wave property of electron talked about.
 
fireflies said:
Hard thing to take. Is this "something" the electron-wave? (Like the OP mentioned)
...
Maybe, maybe not.

Original poster En Joy's comment about an electron-wave "dividing itself into two wavelets" is not quantum mechanics, it's an easily visualized mental picture that may or may not be what's really going on here. Maybe there is a "probability wave" that is as real as the waves on the ocean I'm looking at right now (although this would be a lot more satisfying if we could say what was waving) and that divides into two; but there's nothing in QM that says that has to be what's going on.
 

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