Help a Quantum Noob with the Wavefunction Collapse?

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Discussion Overview

The discussion revolves around the concept of wavefunction collapse in quantum mechanics, particularly in the context of the double slit experiment. Participants explore the implications of measurement on quantum states and inquire about interpretations of quantum mechanics that address paradoxes such as Schrödinger's Cat.

Discussion Character

  • Exploratory, Debate/contested, Conceptual clarification

Main Points Raised

  • One participant questions how interference patterns can be observed in the double slit experiment if measurement causes wavefunction collapse, suggesting that the detection surface may act as a measuring device.
  • Another participant explains that wavefunction collapse occurs into the eigenstate of the measurement operator, noting that different measurements (position at the screen vs. path at the slits) involve different eigenstates and thus different collapses.
  • A participant suggests avoiding collapse-based interpretations of quantum mechanics to reduce intellectual complexity, referencing a previous response for further elaboration.
  • One participant mentions that concepts like the Quantum Eraser challenge traditional views on wavefunction collapse.

Areas of Agreement / Disagreement

Participants express differing views on the implications of measurement and wavefunction collapse, with no consensus reached on the interpretations of quantum mechanics or the nature of measurement in the double slit experiment.

Contextual Notes

The discussion highlights the complexity of interpretations of quantum mechanics and the potential for unresolved paradoxes, particularly regarding measurement and wavefunction behavior.

Meddle
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If matter goes from a superposed state to a collapsed state when measured, how did scientists see the interference pattern in the double slit experiment, doesn't the surface that the photons hit after passing through the slits count as a measuring device?

Also, is there any updated Interpretation of Quantum Mechanics aside from the Copenhagen Interpretation that doesn't conflict with paradoxes like "Schrödinger's Cat"?
 
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Wave function collapses into the eigen state of the measurement operator. If you try to detect which path the particle took, these are your eigen states. For the detector showing interference patterns, the eigen states are completely different. That's the measurement of particle's position at the screen, rather than at the slits. Different operators, different eigen states, different collapse.

But yeah, the state still does collapse due to the measurement. It's just that every state to which it collapses still involves particle going through both slits.
 
Meddle said:
If matter goes from a superposed state to a collapsed state when measured, how did scientists see the interference pattern in the double slit experiment, doesn't the surface that the photons hit after passing through the slits count as a measuring device?

Also, is there any updated Interpretation of Quantum Mechanics aside from the Copenhagen Interpretation that doesn't conflict with paradoxes like "Schrödinger's Cat"?

One wastes less intellectual energy if one avoids collapse-based interpretations of QM.

See my response #4 in this thread:

https://www.physicsforums.com/showthread.php?t=460523
 
Except, you know, things like Quantum Eraser kind of break that concept.
 

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