Talk:Double-slit experiment

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David Deutsch[edit]

David Deutsch says in his book The Fabric of Reality that the Double-slit experiment is a proof for those who argue that Multiverse is real.

The article says nothing regarding the Many-worlds interpretation. May I inquiry why not?

Kartasto (talk) 14:51, 14 July 2014 (UTC)

Please give a page number and a quote to back this up. --Ancheta Wis   (talk | contribs) 15:56, 14 July 2014 (UTC)
The Fabric of the reality, whole chapter 2. Here:[1] is more I suppose...

Kartasto (talk) 16:05, 14 July 2014 (UTC)

The one-line writeup for MWI is making it look fringe, and giving Copenhagen first place and starting its writeup with the word "consensus" is making it look favored. (talk) 10:44, 13 April 2015 (UTC)

I feel we should also show what his logic is, TIME FOR RESEARCH! If I don't come back, find me a wife I tell her I love her, then finish my research. Nector deorum et virorum 00:43, 10 March 2017 (UTC)

New image in lead[edit]

I'm not crazy about the image that has been added to the lead, and its caption. Over the years the lead has been crafted to avoid stating that particles go through the slits. But the image clearly shows particles at the slits, which is probably only a minority interpretation. For anyone trying to understand wave–particle duality and the significance of the experiment, I feel that the image adds more confusion than clarification. -Jordgette [talk] 03:59, 13 January 2015 (UTC)

I agree. I'm sure the editor who added it meant well, but because there is so much confusion about this experiment, it is important to avoid showing a diagram that might give readers the wrong idea. --ChetvornoTALK 06:32, 13 January 2015 (UTC)
Still it is a very common image which you can find everywhere on the internet, I think also on university sites. An image below shows electons, which is based on the same. Therefore it is better to explain then to remove. Even if it would be a minority, then it is a large one.DParlevliet (talk) 08:25, 13 January 2015 (UTC)
Just because it is common does not change the fact that it is bad. There are lots of other double-slit diagrams on Commons. For example [2] shows only a single electron as both a particle and a wave. Or one that just shows waves [3]. If the diagram shows an interference pattern, it shouldn't show particles between the emitter and screen, to avoid giving readers the erroneous notion that the electron follows a "trajectory". --ChetvornoTALK 09:17, 13 January 2015 (UTC)
@Jordgette: I'm the one who added the image. Yes, maybe you are right. Feel free to modify it, or wait until I find a better one myself. I just think that there must be some kind of illustration in the lead. Tetra quark (don't be shy) 15:47, 13 January 2015 (UTC)

Time to step away from the keyboard[edit]

@Kpvats: It's time to stop, please. The encyclopedia has well-known rules, such as the three-revert rule, which you should defer to, or risk being reverted and blocked. --Ancheta Wis   (talk | contribs) 19:42, 18 October 2015 (UTC)

For what it's worth, 'rm' is the Unix command for 'remove'. In the early days (2001), every editor on the encyclopedia was Unix-literate, typically knowing HTML, etc., and the customary edit summary messages stem from this history of tech-speak. --Ancheta Wis   (talk | contribs) 19:46, 18 October 2015 (UTC)

@Kpvats:, Ancheta Wis is right. Your addition doesn't make any sense to me either, and has no sources. See WP:Verfiability:"Any material lacking a reliable source directly supporting it may be removed and should not be restored without an inline citation to a reliable source." Wikipedia works by WP:CONSENSUS; if material you add is controversial you should discuss it first here on the Talk page, rather than just reverting. The electrons do not distinguish between the screen and any other method of observation. Your unsourced addition looks to me like WP:ORIGINAL RESEARCH i.e. your own private opinions. Where are you getting this from? Please read WP:EDIT WARRING. If you don't stop edit warring, I will report you and you could be blocked. --ChetvornoTALK 22:56, 18 October 2015 (UTC)
Given the user's edits on Dark matter, I think they're trying to make a WP:POINT of some sort. I already explained on their talk page that unsourced additions are unsuitable for Wikipedia so it's concerning that they continued to do it on another article. clpo13(talk) 23:34, 18 October 2015 (UTC)


As someone who studied the Double-slit experiment as an undergrad who now works with the invisible sort of electromagnetic radiation a daily basis as an Engineer, I'm now very seriously questioning the results of this experiment. It seems the detector equipment was simply operating near its signal-to-noise ratio detection limit, and thus sometimes detecting a "photon" on one side and not the other. In this explanation the wave is present in both slits and not registering with the detection equipment on both sides at the same time due to lack of signal strength. Can someone please provide a reference that would put my mind at ease? — Preceding unsigned comment added by Einslaten (talkcontribs) 21:16, 3 December 2015 (UTC)

At very low intensity, firing one photon at a time, detectors at both slits never both fire. It's always one or the other. Or, take the slits away -- any time you have particles and detectors, only one detector ever fires per particle; that's uncontroversial in quantum mechanics. Does that help? Perhaps you can be more specific about what claim in the article you're questioning. -Jordgette [talk] 21:35, 3 December 2015 (UTC)
If you believe you are able to fire a single photon as sensed by your detectors, then you should be able to setup an experiment such that detectors are setup at varying distances from the source of the single photon. The amplitude of electromagnetic radiation decreases according to the inverse square law, so you should be able to show that more than one "photon" arrives at detectors closer to the signal source, and prove the "photon" theory is false. Einslaten (talk) 22:19, 3 December 2015 (UTC)
The double slit experiment is extremely well studied and the statements in this article are fairly well sourced. Which specific statements in the article do you question, Einslaten? BTW, it helps readers if you sign your posts by typing ~~~~ after them. --ChetvornoTALK 22:07, 3 December 2015 (UTC)
I question the circular link between the signal source and signal detector, and would like to see a reference to an article that proves a single photon can be emitted by a signal source. Einslaten (talk) 22:19, 3 December 2015 (UTC)
Emission of photons is of course a random process, but basically all you have to do is turn down the intensity of your light source until it is emitting on average one photon a second, or one photon a minute, or whatever rate you want, at which rate only one photon is present in the experimental apparatus at a time. As you mentioned it's not all that easy an experiment because noise due to black body radiation has to be carefully excluded. Here are some sources confirming that the single-photon double slit experiment has been done: [4], [5], [6], [7], [8] I'll add them to the article since that section may not be well-enough sourced. --ChetvornoTALK 22:56, 3 December 2015 (UTC)
None of these references address the explanation that the detection is simply a result of momentarily exceeding the signal-to-noise ratio requirement of the receiver. All electromagnetic wave receivers exhibit a signal to noise ratio requirement. Go buy one and look at the specs, but I guess it's asking to much to look at the Engineering details. (talk) 00:15, 6 December 2015 (UTC)
Yes, it really is. This Talk page is for discussion of the article, not for discussion of the experiment. The article seems to be based on WP:reliable sources which represent the present understanding of the physics profession, traceable to articles in peer-reviewed journals. If you feel we are using bogus sources, or misrepresenting what the sources say, that would be something to discuss here. If you disagree with the sources themselves, that would be something to take up with the authors. --ChetvornoTALK 00:48, 6 December 2015 (UTC)

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