Double slit-experiment confusion

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Discussion Overview

This thread discusses the double-slit experiment, focusing on the nature of wave-particle duality, the emergence of diffraction patterns, and the interpretation of quantum mechanics. Participants explore theoretical implications and conceptual understandings related to the behavior of particles and waves in this context.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants note that the double-slit experiment demonstrates wave behavior, where overlapping waves create a complex diffraction pattern that is not intuitively expected from single particles.
  • There is a question about why the pattern requires multiple repetitions of the experiment, despite the continuous evolution described by the Schrödinger equation.
  • One participant emphasizes that detectors produce a single "dot" per particle, suggesting that many dots are necessary to visualize the overall pattern.
  • Another participant proposes that the waveforms represent potential paths a photon can take before being emitted, indicating that these waveforms exist prior to the experiment and contribute to the diffraction pattern.
  • It is suggested that when a photon exits the device, it interacts with the photon field, allowing it to exhibit behavior that defies classical mechanics, raising questions about the nature of reality at quantum scales.

Areas of Agreement / Disagreement

Participants express varying interpretations of the implications of the double-slit experiment, with no consensus reached on the nature of waveforms, the role of detectors, or the relationship between quantum mechanics and classical reality.

Contextual Notes

Some limitations in the discussion include the dependence on interpretations of quantum mechanics, the ambiguous nature of waveforms, and unresolved questions regarding the transition from quantum to classical behavior.

user30
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https://en.m.wikipedia.org/wiki/Schrödinger_equation

"Two-slit diffraction is a famous example of the strange behaviors that waves regularly display, that are not intuitively associated with particles. The overlapping waves from the two slits cancel each other out in some locations, and reinforce each other in other locations, causing a complex pattern to emerge. Intuitively, one would not expect this pattern from firing a single particle at the slits, because the particle should pass through one slit or the other, not a complex overlap of both."

since the Schrödinger equation is a wave equation, a single particle fired through a double-slit does show this same pattern (figure on right). The experiment must be repeated many times for the complex pattern to emerge."

Why does it need to be repeated many times for the pattern to emerge when the evolution is continious?

It does not state why in the article.

Thanks in advance.
 
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The detectors we use will produce a single "dot" per particle. How can you derive pattern from a single dot?
A number of dots is required to see the pattern. That's what they are saying.
 
hutchphd said:
The detectors we use will produce a single "dot" per particle. How can you derive pattern from a single dot?
A number of dots is required to see the pattern. That's what they are saying.

It's the way it was phrased that confused me.
 
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Am I correct in understanding that the many paths/routes/avenues a photon ( or any subatomic or very small particle ) can take prior to even being shot out of the photon gun in this experiment, is described in physics using math as waveforms? The waveforms represent a concept and the math describes the concept, but there is no true reality of a waveform - it is not a physical entity. So the waveforms are already 'there' prior to the photon being shot out of the gun, and the waveforms have already 'created' all the pathways the photon can take, hence the diffraction pattern. It's like a different type of reality that we cannot yet explain. Only when you interact with the experiment ( eg - using a detector ) does a reality emerge, which we can understand with our known classical reality of physics.
 
When the photon exits the device, it becomes part of the photon field. It can go through both slits and land in a classically incompatible spot on the plate. This is because 'particles' in the lowest scales are restricted from manifesting as classical by the HUP. They cannot have definite properties at all times or electrons would lose energy and spiral into the nucleus. They seemingly can have definite properties, when they get big enough or gain huge energy. It's weird that classical mechanics loses its grip in the micro scale. Lots of questions aren't sufficiently well answered to everybody's liking(there are few issues with qm, but there are many wrt to understanding the macro world now).
 

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