Dirac notation is very expressive: not only does it allow to write quantum states and operations more concisely, it can also be used to shorten written English words and phrases! Here are some examples:
What is shown on the hidden photo?
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asked Mar 6, 2021 at 18:27
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3$\begingroup$ My friend and I created this puzzle for a Christmas-themed mini-escape-room, in which you had to help Santa escape from a quantum lab. Enjoy! $\endgroup$– Mariia MykhailovaCommented Mar 6, 2021 at 18:29
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1 Answer
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The answer is
Silver Tinsel
Because
treating <Ψ| as "BRA" and |Ψ> as "KET" (their names from Dirac notation, as they form the begining and ending "BRAcKET")
We get
coBRA basKET
BRAclet trinKET
celeBRAtion rocKET
viBRAnt marKET
BRAin locKET
zeBRA sKETch
Taking the
letters from the numbered blanks from the pictures
Gives
the Christmassy SILVER TINSEL
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$\begingroup$ "Shorten", as in rot13(ercynpr guerr yrggref jvgu guerr flzobyf? Abg rknpgyl fubegre...) $\endgroup$ Commented Mar 8, 2021 at 14:56