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==Wiki Education Foundation-supported course assignment==
[[File:Sciences humaines.svg|40px]] This article was the subject of a Wiki Education Foundation-supported course assignment, between <span class="mw-formatted-date" title="2021-09-08">8 September 2021</span> and <span class="mw-formatted-date" title="2021-12-19">19 December 2021</span>. Further details are available [[Wikipedia:Wiki_Ed/Northeastern_University/ENGW3307_Adv_Writing_for_the_Sciences_(Fall2021)|on the course page]]. Student editor(s): [[User:Anpa12|Anpa12]].
{{small|Above undated message substituted from [[Template:Dashboard.wikiedu.org assignment]] by [[User:PrimeBOT|PrimeBOT]] ([[User talk:PrimeBOT|talk]]) 17:39, 17 January 2022 (UTC)}}
==Terminology==
I took out that reference because, as the original poster claimed, it was unauthoritative and directly contradicted the dictionary.
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==Vernacular usage==
Why does someone (or several people) keep deleting the section on the vernacular usage of this term? It has been deleted several times by anonymous editors. The section seems good to me. This is an actual usage of the term, and it is useful having a section that compares and contrasts the vernacular usage with the physics usage.--[[User:Srleffler|Srleffler]] 12:57, 21 February 2006 (UTC)
:Maybe it should be pointed out that a quantum leap is the smallest imaginable state change, whereas it's commonly used as a synonym for "large step for mankind". <span style="font-size: smaller;" class="autosigned">—Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/84.189.37.108|84.189.37.108]] ([[User talk:84.189.37.108|talk]]) 10:53, 13 January 2009 (UTC)</span><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->
==TV series==
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Many standard quantum mechanics textbooks, such as Merzbacher, and Landau and Lifshitz, use the term "electron" for brevity and concreteness when referring to some quantum mechanical object, although they mention this explicitly in a footnote within the first few pages.[[User:131.111.213.41|131.111.213.41]] 14:38, 4 November 2007 (UTC)
::Yes, technically any particle or system that is 'bound'; nucleons, phonons, positronium, etc. will have quantized energy levels, and the transitions between these levels could be described as 'quantum leaps'. --[[User:Chetvorno|<
== It's not used by scientists ==
It might be worthwhile noting that although the term is used by scientists to explain quantum mechanics to nonscientists, it is not used by scientists among themselves, who are more likely to use terms like "atomic transition". To get an idea of how the term was used in published literature, I looked at the first 400 hits on Google Books. Leaving out references to the television show, the most common useage was as a metaphor in New Age and business innovation books. There was much use in general interest books about science: such as [http://books.google.com/books?id=IWvreEoFhPMC Brian Clegg (2009) ''Instant Egghead Guide to Physics''], [http://books.google.com/books?id=DFF-i63WLdIC&printsec=frontcover&dq=bill+nye&cd=1#v=onepage&q=&f=false Bill Nye (1993) ''The Science Guy's Big Blast of Science''], [http://books.google.com/books?id=sSmEPwAACAAJ&dq=gribbin+Einstein&hl=en&ei=fXywS6LsMNXo4gaZjO3gDw Gribbin (1997) ''Einstein: a life in science''], [http://books.google.com/books?id=P2V1RbwvE1EC&printsec=frontcover&dq=Alan+guth+inflationary+univers&hl=en&ei=2XywS4HxDcy94gbmt9CWBQ&sa=X Alan Guth (1998) ''The Inflationary Universe'']. There were almost no uses in professional scientific literature; the few times it occured it was used as a metaphor for innovation: [http://books.google.com/books?id=4mosAAAAYAAJ Richard Leavens (1988) ''Interfaces, Quantum Wells, and Superlattices'']. One of the few uses by a scientist to refer to atomic transitions was [http://books.google.com/books?id=u1UmAAAAMAAJ&q=Arnold+sommerfeld&dq=Arnold+sommerfeld&hl=en&ei=toCwS8OqB4jh4gb4uJTFDw Arnold Sommerfeld (1934) ''Atomic Structure and Spectral Lines''] --[[User:Chetvorno|<span style="color:blue">Chetvorno</span>]]<sup>''<small>[[User talk:Chetvorno|<span style="color:Purple">TALK</span>]]</small>''</sup> 10:34, 29 March 2010 (UTC)
== "few nanoseconds or less" ==
First, the timing depends on the energy gap value. Second, it is generally not correct to suggest a picture like
* the "↑" state before {{math|''T''<sub>0</sub>}}
* transition started at {{math|''T''<sub>0</sub>}}
* intermediate state between {{math|''T''<sub>0</sub>}} and {{math|''T''<sub>1</sub>}}
* transition ended at {{math|''T''<sub>1</sub>}}
* the "↓" state after {{math|''T''<sub>1</sub>}}.
In the [[Schrödinger picture]], we will always see some [[quantum superposition|superposed]] state with the ↑ amplitude gradually decreasing and ↓ amplitude increasing. More general, the moment of a transition is always [[uncertainty principle|uncertain]], and speculation such as "transition started at… and ended at…" do not have a sense. [[User:Incnis Mrsi|Incnis Mrsi]] ([[User talk:Incnis Mrsi|talk]]) 20:03, 22 September 2012 (UTC)
:The moment (on the time scale) of a transition is uncertain (Poissonian statistics for a single atom/ion). Nevertheless the time for a transition (jump) is always shorter then statistical period of jumping cycle (interval between jumps) - obtained from [[density matrix]] ("superposition"). You can see (experimental - not speculation) it in wiki reference[http://www.mpq.mpg.de/Theorygroup/CIRAC/wiki/images/8/86/Samuel.pdf] (page 3). The probability for given state is very close to 1 between jumps. It is similar as the radioactive decay. A given (long-living radioactive) nucleus is in an excited state (with probability about 1) until its decay (unpredictable when but statistically predictable from this matrix element). But it does not mean that nucleus is decaying - e.g. millions years - and that we can not say (at any time) which (chemical) element it is (In reality, decay/transition itself is very fast - "few nanoseconds or less"). [[Special:Contributions/195.113.87.138|195.113.87.138]] ([[User talk:195.113.87.138|talk]]) 13:09, 2 October 2012 (UTC)
== Quantum leap ==
As far as I know this phrase is slightly more specific than "big increase". The phrase is more synonymous with "[[paradigm shift]]", and presumably has arisen because quantum mechanics is one of the most important discoveries in science, and the word "leap" is in some senses similar to "advance" (eg, "a giant leap for mankind"). Hence, probably, some layman heard this phrase and assumed it meant "the advance in physics associated with quantum theory" and it stuck. Not that I'm an etymologist or a lexicographer or anything. <span style="font-size: smaller;" class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/86.30.133.31|86.30.133.31]] ([[User talk:86.30.133.31|talk]]) 19:23, 24 January 2013 (UTC)</span><!-- Template:Unsigned IP --> <!--Autosigned by SineBot-->
I think the link is simpler and more analogous than that - it's a not a big nor a small but a definite jump, without significant intermediate steps. [[Special:Contributions/212.250.220.116|212.250.220.116]] ([[User talk:212.250.220.116|talk]]) 13:07, 30 April 2013 (UTC)
== Removed obscure sentence ==
I removed the following sentence. It is expressed obscurely (what is "doubt"?) and it does not give any context or motivation. It appears to concern stimulated emission (or absorption) in an individual atom, so it would be quite interesting to see it explained.
:''The prediction expressed in the paper<ref>http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.54.1023 - Richard J. Cook, H. J. Kimble, 1985</ref> and doubt was present in the 1980s.<ref>http://tf.boulder.nist.gov/general/pdf/2723.pdf - Early observations of macroscopic quantum jumps in single atoms</ref> Nevertheless it was shown experimentally, that the fluorescence rate of a single atom can not be calculated by [[Maxwell-Bloch equations]].'' <small class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/178.38.100.30|178.38.100.30]] ([[User talk:178.38.100.30|talk]]) 17:43, 27 April 2015 (UTC)</small><!-- Template:Unsigned IP --> <!--Autosigned by SineBot-->
== Plan to edit ==
I am editing this article for a class and plan to make the following changes in the coming weeks:
* Finding more information and dividing into the following sub-headings:
** History or discovery
** Details of process of transition
** Applications
* Improving reliability of sources. Some are only from the arxiv.
* Adding pictures, including this one: https://en.wikipedia.org/wiki/User:Anpa12/sandbox#/media/File:Bohr-atom-electron-to-jump.svg
Let me know if there's anything else I should be keeping in mind. --[[User:Anpa12|Anpa12]] ([[User talk:Anpa12|talk]]) 15:46, 16 November 2021 (UTC)
{{reflist-talk}}
== wrong connection English><Deutsch Falsche Verbindung ==
I doubt that the connection between [[Atomic electron transition]] and [[de:Elektronischer Übergang]] is all correct. Certainly [[de:Quantensprung]] which used to be the scientific term is nowerdays only used metaphoricaly and thus not equivalent to [[Quantum Jump]] which it is connected with. Still the latter is also used figuratively as explained in [[paradigm shift]]. This obviously has a broader meaning because it is connected to [[de:Paradigmenwechsel]]. This topic is posted on the talk pages of all linked articles. I recommended to discuss in one place: [[de:Diskussion:Quantensprung#Falsche Verbindung Deutsch><English wrong connection]]<br><br>Ich zweifle, dass die Verbindung zwischen [[Atomic electron transition]] und [[de:Elektronischer Übergang]] ganz korrekt ist. Jedenfalls wird der ehemalige entsprechende Fachbegriff [[de:Quantensprung]] nur noch im übertragenen Sinne gebraucht und ist damit beim wissenschaftlichen Fachbegriff [[en:Quantum Jump]] falsch. Die Nutzung im übertragenen Sinn gibt es im English auch unter [[paradigm shift]]. Das hat wohl einen weiteren Bedeutungsraum und führt daher zum deutschen [[de:Paradigmenwechsel]]. Dieses Thema wird in den Diskussionen zu allen genannten Artikeln veröffentlicht. Ich empfehle die Beratung an einem Ort zu konzentrieren. <br>[[de:Diskussion:Quantensprung#Falsche Verbindung Deutsch><English wrong connection]] [[de:User:Oeconormal|Oeconormal]] ([[de:User talk:Oeconormal|talk]]) 15:40, 4 June 2024 (UTC)
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