Single photon double slit, reset detector after each impact

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Discussion Overview

The discussion centers on the experimental outcomes of a single photon or electron double slit experiment, specifically under the condition that the detector is reset after each detection. Participants explore the implications of this setup on the resulting interference pattern and the nature of the detectors used.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose that the outcome would resemble that of a constant medium, where individual detection points appear random initially but reveal a wave-interference pattern as data accumulates.
  • Others express a desire for clarity on whether experiments have been conducted with detectors that reset after each detection, questioning the existence of such setups.
  • One participant suggests that many modern experiments likely use resetting detectors, such as high precision CCDs, but acknowledges uncertainty about whether they reset after each photon detection.
  • Another participant emphasizes the importance of removing memory from the detector and discusses the concept of a computer acting as the true detector when recording impact positions.
  • Some participants mention specific types of detectors, like photomultiplier tubes, which reset after detecting a photon, while others clarify the operational details of these devices.
  • There is a suggestion for a procedural design to fire single photons while ensuring the detector is cleared before the next photon is fired, but participants note a lack of existing experiments that meet these criteria.
  • One participant references a C60 double slit experiment, indicating that the nature of detection for massive particles differs significantly from that of photons.

Areas of Agreement / Disagreement

Participants express differing views on the use of memoryless detectors and whether they have been employed in past experiments. There is no consensus on the existence of experiments that meet the specific conditions outlined in the original post.

Contextual Notes

Participants highlight limitations in the current understanding of detector technology and its implications for the experimental outcomes, with some noting that the interference pattern may be influenced by the type of detector used and its operational characteristics.

  • #31
UfoOvni said:
http://www.sao.ru/drabek/CCDP/Hamamatsu/CAMERAS/PiasE.htm .
It offers a large detection surface (20 mm dia) .
and can be scanned (read) while counting ( counting measurement is not affected by the scan TV rate )
There is no need to presume.
No one appears to be interested in finding the requested exeriment.
I'm sorry.
Don't worry. We all think we can pick holes in QM when we first come across it. Your experiment would not prove anything as I have already explained. Or rather it would only produce a significant result if detectors had memories. This would show up in an elementary analysis of detector performance. You would not need an elaborate experiment such as the one you propose. Manufacturers and researchers would have found the effect long ago whenever they perform standard autocorrelation tests to ensure that their detectors work properly. A significant result would have been all over the news: "Elementary experiments in a Chinese factory disprove quantum mechanics once again."
 
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  • #32
UfoOvni said:
http://www.sao.ru/drabek/CCDP/Hamamatsu/CAMERAS/PiasE.htm .
It offers a large detection surface (20 mm dia) .
and can be scanned (read) while counting ( counting measurement is not affected by the scan TV rate )
There is no need to presume.
Yes, you are right.
UfoOvni said:
No one appears to be interested in finding the requested exeriment.
I'm sorry.
I would say that no one (including me) believes that such an experiment has ever been performed.
Sorry.
 
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  • #33
UfoOvni said:
I'm starting to study QM and I can not afford to take for granted the neutrality of the detector, even if most of others apparently presume it as a fact.
If it is, as you say, 'well established' then show me the experiment. I'm not asking for opinions.

And yet, an opinion you will get... :)

You don't have to accept anything, including the "neutrality of the detector". However, as a newbie, picking and choosing what you accept from basic theory/experiment will not be very productive. There is no generally accepted theory that indicates that the "reset" button changes the results in any meaningful manner. There is also no generally accepted theory that says the results are different on Thursdays. Perhaps theory is wrong and an experiment would show as much.

But... there are many scientific tests performed which are not written up and published. I would say that many if not most "null" results do not find their way into the literature. So you may need to perform the test yourself if you want to see it published to your satisfaction.

On the other hand, there has been work performed with *theory* (not experiment) to show that some kind of quantum "memory" exists. Unfortunately, such work has failed to explain most of the basics and so has been contradicted by experiment. See for example (and note that the detector does not need to be the source of the hypothetical memory):

http://arxiv.org/abs/1012.0647
Beam-splitters don't have memory: a comment on "Event-based corpuscular model for quantum optics experiments'' by K.Michielsen et al
 
  • #34
DrChinese said:
And yet, an opinion you will get... :)

You don't have to accept anything, including the "neutrality of the detector". However, as a newbie, picking and choosing what you accept from basic theory/experiment will not be very productive.

Thank you.
I'm very curious about the experimental outcome and I will not be surprised if the result is not the most expected one.
I'm not aware of the theory you have linked. ("EBCM does not faithfully reproduce all experimental data" is not a good start)
I do not know if QM can accommodate , or not, a null result, i.e. without interference on the aggregation of all the partial images colected.
I'd make the test if I could.
 
  • #35
DrChinese said:
And yet, an opinion you will get... :)...
Beam-splitters don't have memory: a comment on "Event-based corpuscular model for quantum optics experiments'' by K.Michielsen et al
I suppose my comment about a Chinese factory was bound to elicit a reponse from you :biggrin:.
Section E is very clear. In particular it refers to the anomalous statistics that must occur while a memory-ridden device settles down.
 
  • #36
Derek Potter said:
I suppose my comment about a Chinese factory was bound to elicit a reponse from you :biggrin:.
Section E is very clear. In particular it refers to the anomalous statistics that must occur while a memory-ridden device settles down.

In that E Section : "In WT a single event (i.e., a photon entering the interferometer) leaves no trace (memory) in the apparatus. The device behaves in the same way for the firstevent and for event number 10000"
The result of the experiment I devise has the potential to clarify that sentence.
I follow Descartes in Discourse_on_the_Method "The first was never to accept anything for true which I did not clearly know to be such; that is to say, carefully to avoid precipitancy and prejudice,.." (roots of the Scientific method)
 

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