Hi, I am not sure if this is the right way of contacting you on Wikipedia, but I am guessing it might work, so here goes. I have been looking at the Delayed Choice Quantum Eraser page, and noticed you giving some knowledgeable responses on the talk-page; I don't actually know if they were knowledgeable, but at least they look as if they are ;-) The bit I was wondering about concerns directly detecting an interference pattern in the top (simple) half of the experimental setup, if the lower half is removed (i.e. no explicit detector is used on the entangled idler particles). If you look at the talk-page of the Delayed Choice Quantum Eraser page, under the heading "Questions on slightly changed setup", you will see my question in more detail there. I am looking for a paper on an experiment where the interference pattern of entangled particles is directly visible. If you know of such a paper, I would be very grateful if you could give me the reference, or perhaps direct me to someone that might have it! I will have a look at this page under this heading from time to time to see if you have made a response. --89.253.76.71 (talk) 22:11, 22 July 2012 (UTC)
"I am looking for a paper on an experiment where the interference pattern of entangled particles is directly visible. " -- What would happen if you started out with the laser of the experiment described in this article, and you kept the BBO and Glan-Thompson prism, but then you duplicated the top limb as the bottom limb. There being no double-slit anywhere, you would get, basically, two spots of light, one for D0 and one for the new detector that is its stand-in in the bottom limb. Then what would happen if you put a double-slit apparatus in either the upper or the lower limb? Both members of each pair of entangled photons would have a simple psi-function before one or the other hit the double-slit. What would happen to the entangled psi-functions after one of them hit a double slit? Is it the case that when the identical psi-function that resides at two positions in space hits the double-slit, then the identical psi-function that proceeds in two directions thereafter is a pair of psi-functions that are going to interfere and thus demonstrate interference? Or is it the case that when the identical psi-function that resides at two positions in space does not hit the double-slit, then the identical psi-function that proceeds in two directions thereafter is not a pair of psi-functions because nothing has happened to cut it (as the double-slit apparatus would), and there is nothing to interfere with itself and therefore no potential for interference phenomena to be manifested? In other words, which experience in the two limbs takes precedence? Does the splitting in one limb split the psi-function in the other limb despite nothing having happened to it at that locality? Or does the non-splitting in the other limb heal the split in the psi-function in the other limb despite nothing additional having been done to it after it went through the double-slit apparatus?
If you set up such an experiment, then you would presumably get the same result in both limbs. Either you would get two interference patterns, or you would get two spots. You would in either case explain what happened as an example of entanglement. If you got an interference pattern in the limb with the double-slit apparatus, but you got a single spot of light in the other limb, then you would conclude that entanglement was not taking place or was not the kind of phenomenon that you thought it was.
I don't know whether it is right or not, since the whole idea of causality has been getting pretty mushy, but the idea seems to be that if you have two entangled photons and you "do something" to one of them, then some change is manifested in the form of a "correlation" even though you have not "done anything" to the entangled twin. If you have not "done anything" to one of the entangled photons, then you cannot expect to have "done something" to the entangled twin. But you can't mess with Einstein and causality. So you can't speak of "doing something" to an entangled photon by "doing something" to its twin.
If you look at this problem from a stretched mind point of view, there is only one psi-function and regardless of what it looks like from a human-in-space-time point of view, if you do anything to this psi-function "as though it were located in this position, or as though it were located in that position," you change it. If you do nothing to this psi-function, then you don't change it. When you have one psi-function and you put it through a double-slit apparatus, then you change it in all its "locations," and so you should expect it to exhibit interference phenomena in all its "locations."
I'll look around to see whether anybody has made a "Y" configuration experiment and put a polarizer in one fork, or a double-slit in one fork, or something of that sort.P0M (talk) 14:20, 24 July 2012 (UTC)
See: http://upload.wikimedia.org/wikipedia/commons/9/90/Walborn_EtAl_QuantumEraser.svg P0M (talk) 14:36, 24 July 2012 (UTC)
This article may be what you want: http://www.scribd.com/doc/58640003/Walborn However, I don't see any indication that they have actually looked at whether an interference pattern is delivered to Dp, their upper-limb detector. P0M (talk) 15:11, 24 July 2012 (UTC)
If you put your eye where D3 is, you would see only the photons corresponding to the psi-function that, as split into two parts by the double-slit, bounced off of BSa. The other part of that same psi-function has gone off to D4, so for this one entangled photon that came out of the BBO, you will either get half of the psi-function and it will "show up" as a scintillation on your retina, or you will get nothing because the other half has gone somewhere else. There is only one path that leads to your eye that is standing in for D3. If you stand in for D4, then the same thing will happen. You will either get nothing or you will get one photon smack in the middle of where the "straight line" trajectory of the photon will place it. Presumably (and I'll come back to this presumption in a minute) if your twin stood at D0 then s/he would in each of these cases shout out, "dead center hit!" If you stood in for D1 or D2 then, if the rate of single photons being fired out of our expensive single-shot laser was fast enough, persistence of vision would let you see a typical Young experiment type of interference pattern. And your twin would see a mish-mash because his two patterns would coalesce into one, and also the center would be brighter than for a regular Young type interference pattern. That being said, you would nevertheless be seeing an interference pattern formed by entangled photons whenever you stood in for either D1 or D2. If you really wanted to peel apart the four layers that your twin was seeing, the we would need to re-introduce the coincidence counter and use it to sort photons into four groups at D.
As to the "presumption" mentioned above, note that by D0 there is a little vertical line and an "x." That stuff is there to indicate that the experimenters have put the detector on a sort of trolley operated by a stepping motor. Evidently a small detector sensitive enough to pick up individual photons was all they could build or afford to build, so they made this one detector look at a single "line" at a time, and moved it along to its next position after a certain amount of time had elapsed. So it operates rather like a scanner that turns your hand drawing into a JPG image. If only single photons were coming through in the upper limb of the experiment, and they were not forming any kind of extended pattern, then there would be no point of looking anywhere but the center of the straight-line trajectory coming out of the laser, BBO, etc. and into the upper limb of the experiment. So they had to have been getting an extended pattern, and the only extended pattern they would not have thought worthy of special mention would have been the typical Young-s interference pattern.
If you want an experiment that does not involve a coincidence counter, then I suspect that you will have to wait for an experimental apparatus that spits out only entangled photons.P0M (talk) 15:29, 27 July 2012 (UTC)
Thanks! - You and Chris Howard have succeeded (in changing my mind and returning). Thanks for standing up for me in numerous places during that "Hublolly" incident I was not aware of - its very kind of you! Maschen (talk) 00:47, 15 August 2012 (UTC)
Hi Pat, it was all thanks to you that I could get used to learning on Wikipedia. I have read over a thousands articles and learned how to answer most of my own questions. Now I want to ask you one more favor in order to pick up the pace. I hope you can check your email inbox before the end of this month. Thank you Pat.Mastertek (talk) 14:41, 24 November 2012 (UTC)
Hello, Patrick0Moran.
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Hello. I noticed that you mentioned "the original MIT series written by Francis Weston Sears" on the Intro to QM talk page. I know that you linked to a book on Amazon.com, however, since you mentioned an "MIT series" I was wondering if this set of books on Goodreads is the series to which you are referring? I am referring to the titles on this page minus the "University Physics" that you did not appreciate way back when. Also, I just noticed a "University Physics. Volume 3", so is this also a series of some sort? ---- Steve Quinn (talk) 22:01, 6 June 2013 (UTC)
are missing a description and/or other details on their image description pages. If possible, please add this information. This will help other editors make better use of the images, and they will be more informative to readers.
If you have any questions, please see Help:Image page. Thank you. Message delivered by Theo's Little Bot (opt-out) 16:05, 12 July 2013 (UTC)DP attempted to perform a preemptive strike against me by reporting me to the edit warring noticeboard.
He didn't succeed in getting me blocked, of course, but you may wish to visit the page to add your comments. They could be useful in the future. Stigmatella aurantiaca (talk) 13:34, 6 February 2014 (UTC)
I'm having a difficult time with the Retrocausality section. I haven't yet found any review articles that treat the subject broadly or with any pretense at objectivity. Every paper on this subject, even those purporting be reviews, presents a strongly distinct POV, and I can't rely on my BS detection instincts.
Any suggestions? Stigmatella aurantiaca (talk) 03:17, 14 February 2014 (UTC)
I removed a lot of cruft from the retrocausality discussion. We have a number of key citations to fill in. Stigmatella aurantiaca (talk) 08:27, 14 February 2014 (UTC)
I think the draft is approaching the point where we need to get Cthugha82's take on it. What do you think? Stigmatella aurantiaca (talk) 10:50, 14 February 2014 (UTC)
I did another major swoop through the draft, mostly to simplify overly complex sentences that I let slide the first time through, but also a lot of simple copyediting. Please check over to make sure that I haven't adversely changed their intended meanings. Thanks! Stigmatella aurantiaca (talk) 16:31, 15 February 2014 (UTC)
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DP is inserting his say in Talk:Counterfactual definiteness and Talk:Mach–Zehnder interferometer, saying that everything is perfectly explained by classical wave arguments. Stigmatella aurantiaca (talk) 00:27, 26 February 2014 (UTC)
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Hello, I notice you have recently been involved in the above article. I have proposed a complete rewrite on the talk page, and have done a rewrite on my sandbox. Please give your opinion? Mcplums (talk) 21:49, 20 March 2014 (UTC)
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Hi Patrick0Moran! As a Steward I'm involved in the upcoming unification of all accounts organized by the Wikimedia Foundation (see m:Single User Login finalisation announcement). By looking at your account, I realized that you don't have a global account yet. In order to secure your name, I recommend you to create such account on your own by submitting your password on Special:MergeAccount and unifying your local accounts. If you have any problems with doing that or further questions, please don't hesitate to contact me on my talk page. Cheers, —DerHexer (Talk) 01:13, 17 January 2015 (UTC)
You and Doc James seem to have an interest in "spider bite" wiki. I disagree with the lead in. I have science as my forte but then thought it could help to have culutre as well. so something like this " Spider bites have been implicated in many ailments through history. Notably wild dancing in the Middle Ages, death between the Great Wars, and skin ulcers in the 21st Century. Although the fear of spiders may be a European trait ref Davey, G. C. (1994). The" disgusting" spider: The role of disease and illness in the perpetuation of fear of spiders. Society and Animals, 2(1), 17-25. Scientific advancement in Industrial Revolution and later put doubt into medical consequences of spider bites. Commonly held beleifs about spider bites were debunked as folktale and myth. California physician Emile Bogen cemented the consequences of black widow envenomation, or arachnidism, in the 20's ref Bogen, E. (1926). Arachnidism: a study in spider poisoning. Journal of the American Medical Association, 86(25), 1894-1896. Several other types of arachnidism have been described since, however, folktale and myth still dominate the perception of spider bites. Importantly, most arthropod bites are not from spiders, no spider bite is typically fatal to humans and most skin wounds are not from a spider bite. — Preceding unsigned comment added by Moderntarantula (talk • contribs) 19:37, 19 January 2015 (UTC)
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Hello PatrickoMoran, I read in an old article on Taekwondo where you made a comment about Mr. Charles Bewley. I used to train with him back in the 1974 time-frame in Colorado. RobertRGoldsworthy (talk) 16:05, 27 May 2018 (UTC)Robert GoldsworthyRobertRGoldsworthy (talk) 16:05, 27 May 2018 (UTC)
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Hi P0M, on 6 December 2011 you rewrote a sentence on the EPR Paradox article, the wording of which survives to this day! I'm having a little trouble parsing it, and hoped you might be able to clarify. "EPR tried to set up a paradox to question the range of true application of Quantum Mechanics".
I think there is a small grammatical issue here, but I can't decide if it should actually be "the range of true applications of Quantum Mechanics", or something else. Or perhaps I'm misreading! As you noted at the time, this stuff takes some digesting. But I'm also stuck on what the word "application" means here. If it said "...the range of interpretations..." I would be merrily on my way to the next sentence, and eventually (hopefully) able to get back to watching Avengers: Endgame. But now I'm wondering what Quantum Mechanics is being applied to, here. Modeling reality? I hope you see this and can shed some light. Thank you! 68.197.169.26 (talk) 02:44, 30 July 2021 (UTC)
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