Confusions about some symbols in QC

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  • Thread starter Haorong Wu
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Summary:

Confusions about some symbols in QC
There are some pictures in Nielsen's book that I find confusing:

微信图片_20190523080457.jpg
Why there is a line half-crossing the X-box?

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Similarly, why there is a line connecting to ##f \left ( x \right )##?

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There are two H gates between ##\left | \psi _0 \right >## and ##\left | \psi _1 \right >##. Why one of them has a line crossing it, while the other one only has a line half-crossing it?

微信图片_20190523080443.jpg
Similarly, why the H gates have no lines crossing them in this picture? In the "Nomenclature and notation" section, the quantum gates are all crossed by lines. What's the differences between them?

Well, if there are just several inconsistent pictures, I would say the book has some errors. But I find there are pretty much strange appearances. Maybe I overlook some important part about those lines?
 
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DrClaude
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These are just "typographical" error. The figures appear to have been done in LaTeX, so it may just be a problem of how they were rendered for the book.
 
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These are just "typographical" error. The figures appear to have been done in LaTeX, so it may just be a problem of how they were rendered for the book.
(@.@).....Ah..All right. So, should there be lines crossing those squares?
 

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