A simple question on a modified Double-Slit Experiment

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Discussion Overview

The discussion revolves around the modified double-slit experiment, specifically addressing whether an interference pattern would emerge on a half-screen instead of a full detection screen. Participants explore the implications of this modification within the context of quantum mechanics.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant questions if a half-screen would still produce the same interference pattern as a full screen, suggesting that inaccuracies in actual experiments might inform the answer.
  • Another participant asserts that the entire screen is not necessary for the interference pattern to emerge, indicating that a half-screen would suffice.
  • A participant inquires whether any experiments have specifically tested the half detection screen scenario, highlighting the counter-intuitive nature of quantum mechanics.
  • There is a mention of multiple modified experiments, with one participant expressing curiosity about the specific modifications being referenced.
  • Another participant notes that in real experiments, individual photons are often detected without a screen, using a single detector that can be moved, which raises questions about the necessity of a full screen.
  • A participant reflects on their earlier question regarding whether a single detector would yield the same pattern as a full screen, concluding that it would, which leads them to reconsider their initial thoughts.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of a full screen for the emergence of an interference pattern. While some assert that a half-screen would work, others question the experimental evidence supporting this claim. The discussion remains unresolved regarding the specific outcomes of experiments with half screens.

Contextual Notes

Participants acknowledge the complexities and counter-intuitive aspects of quantum mechanics, which may influence interpretations of the double-slit experiment. There is also a lack of definitive experimental evidence cited regarding the use of a half-screen.

Izhaki
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I guess inaccuracies in the actual experiment suggests the answer for this question. But would still ask to confirm.

If instead of using a whole screen, one simply puts half a screen. That is, from a top view the screen extends upwards from the central beam axis, also right in the middle between the two slits. Something like this:


...|...|
....|
beam>...|...|
.....
...|...



Would the same interference pattern emerge on that half screen?

Thanks!
 
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Izhaki said:
I guess inaccuracies in the actual experiment suggests the answer for this question. But would still ask to confirm.

If instead of using a whole screen, one simply puts half a screen. That is, from a top view the screen extends upwards from the central beam axis, also right in the middle between the two slits. Something like this:


...|...|
....|
beam>...|...|
.....
...|...



Would the same interference pattern emerge on that half screen?

Thanks!



Yes it would. The entire screen does not need to be present.
 
Thanks!
 
DrChinese: has any experiment been done with half detection screen? Since QM is fully counter-intuitive surprises, I wonder if anyone has bothered to check.
 
Which modified experiment are you referring to; I have seen at least three, and would not be surprised if there were many more.
DC
 
the detection screen is halved as asked in the original question. I am curious if anyone has confirmed that interference pattern of single electron build up is unchanged on the half screen.
 
Xverse said:
the detection screen is halved as asked in the original question. I am curious if anyone has confirmed that interference pattern of single electron build up is unchanged on the half screen.
I don't know if double-slit experiment has been performed with halved screen but in real experiments where you count individual photons it is usual that there is no screen at all but just single detector that is moved around in single plane (line actually).
 
zonde said:
I don't know if double-slit experiment has been performed with halved screen but in real experiments where you count individual photons it is usual that there is no screen at all but just single detector that is moved around in single plane (line actually).

Hi Izhaki, for example delayed choice quantum eraser uses a single detector that is moved around. there are many more as Zonde has mentioned above.

http://en.wikipedia.org/wiki/Delayed_choice_quantum_eraser

I had a similar question, early on... just that it was the other way around...;)

namely ...would a single detector show the same pattern as a whole big (stationery) screen that covers/catches most of the photons/pattern?

the answer, of course, is yes and it helps rule out a lot of imagination/hypothesis...
 
http://en.wikipedia.org/wiki/Delayed...quantum_eraser

Thanks for the link!

Yes, shortly after submitting the post I've realized that whether the detector is halved or tilted, one should see a similar pattern. So some hypothesis I toyed with went out of the window.

What I'm trying to say is that I reckon my question was stupid to begin with. It is still nice to have people affirming what was wrong thinking to begin with.
 
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