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How do you read <a|b>? "Bracket a b", "a times b", something else? -- Sigmundur ( talk) 08:39, 8 March 2018 (UTC)
The lead says "A ket looks like " | v ⟩ ". Mathematically it denotes a vector, v , "
... from which one would expect that the symbol found inside a ket would be the name of a vector. That is, take that symbol outside the ket, stick an arrow on top (or style it bold), and you have a vector in conventional notation.
However, evidently there are additional ket conventions. One is apparently to place an integer inside the ket. This is obviously not the name of a vector per se. Apparently it indicates one of the orthonormal basis vectors. So |2> indicates the second basis vector, perhaps j-hat (or ey).
An example; https://quantum.phys.cmu.edu/CQT/chaps/cqt03.pdf page 32
Taking this further, some authors apparently may place a variable inside the ket, such as | n >, to indicate the nth basis vector, perhaps useful in a summation. But that is indistinguishable syntactically from the normal ket usage, and mistakenly suggests that n might be a vector.
At any rate, because a reader may well be visiting the page to try to interpret the bra-ket notation they've newly encountered written somewhere, it would be helpful if variants such as the one I just described could be discussed in the article in an orderly fashion. Gwideman ( talk) 15:54, 22 February 2021 (UTC)
Interesting the way |ψ><ψ| has a crossing X like ⊗ in the middle. Starple ( talk) 23:10, 26 March 2021 (UTC)
Removed request after providing the information.
This article's lead section may be too technical for most readers to understand.(May 2022) |
Hopefully the simplification is acceptable because the topic loses something important if any further condensing is done. Astrojed ( talk) 03:07, 5 February 2023 (UTC)
Provided a lead section and removed the notice of it missing.
This article has no
lead section. (February 2023) |
This is a highly technical topic used in some quantum mechanics. A general practitioner of science may understand it if somewhat knowledgeable about quantum mechanics, complex numbers, vector products, and matrix algebra. A well qualified editor might make the improvements that are requested. Astrojed ( talk) 08:46, 11 February 2023 (UTC)
The article is suitably referenced, with inline citations. It has reliable sources, and any important or controversial material which is likely to be challenged is cited.The article needs a reassessment.
The article is reasonably well-written.(#4). The issues are not indicative of "well-written". -- Otr500 ( talk) 08:43, 27 February 2023 (UTC)
This Â
level-5 vital article is rated C-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||||||
|
Index
|
||
This page has archives. Sections older than 90 days may be automatically archived by ClueBot III when more than 5 sections are present. |
This page has archives. Sections older than 90 days may be automatically archived by ClueBot III when more than 5 sections are present. |
How do you read <a|b>? "Bracket a b", "a times b", something else? -- Sigmundur ( talk) 08:39, 8 March 2018 (UTC)
The lead says "A ket looks like " | v ⟩ ". Mathematically it denotes a vector, v , "
... from which one would expect that the symbol found inside a ket would be the name of a vector. That is, take that symbol outside the ket, stick an arrow on top (or style it bold), and you have a vector in conventional notation.
However, evidently there are additional ket conventions. One is apparently to place an integer inside the ket. This is obviously not the name of a vector per se. Apparently it indicates one of the orthonormal basis vectors. So |2> indicates the second basis vector, perhaps j-hat (or ey).
An example; https://quantum.phys.cmu.edu/CQT/chaps/cqt03.pdf page 32
Taking this further, some authors apparently may place a variable inside the ket, such as | n >, to indicate the nth basis vector, perhaps useful in a summation. But that is indistinguishable syntactically from the normal ket usage, and mistakenly suggests that n might be a vector.
At any rate, because a reader may well be visiting the page to try to interpret the bra-ket notation they've newly encountered written somewhere, it would be helpful if variants such as the one I just described could be discussed in the article in an orderly fashion. Gwideman ( talk) 15:54, 22 February 2021 (UTC)
Interesting the way |ψ><ψ| has a crossing X like ⊗ in the middle. Starple ( talk) 23:10, 26 March 2021 (UTC)
Removed request after providing the information.
This article's lead section may be too technical for most readers to understand.(May 2022) |
Hopefully the simplification is acceptable because the topic loses something important if any further condensing is done. Astrojed ( talk) 03:07, 5 February 2023 (UTC)
Provided a lead section and removed the notice of it missing.
This article has no
lead section. (February 2023) |
This is a highly technical topic used in some quantum mechanics. A general practitioner of science may understand it if somewhat knowledgeable about quantum mechanics, complex numbers, vector products, and matrix algebra. A well qualified editor might make the improvements that are requested. Astrojed ( talk) 08:46, 11 February 2023 (UTC)
The article is suitably referenced, with inline citations. It has reliable sources, and any important or controversial material which is likely to be challenged is cited.The article needs a reassessment.
The article is reasonably well-written.(#4). The issues are not indicative of "well-written". -- Otr500 ( talk) 08:43, 27 February 2023 (UTC)