Thank you! I missed the little ket inside the triangle pointing the opposite way. Forgive me.
That's state representation in a quantum circuit diagram (eg similar to gates etc). The motivation to pick a triangle is to have similar icons/pictures like quantum processes/diagrammatic approach. The state's Dirac notation is also shown inside that gray triangle.
The Dirac notation can be also obtained as TraditionalForm of a quantum state. Look at this notebook for more details:
The statement above the very first gray left-pointing triangle calls it a 'ket" if I read it correctly. The very first right-pointing symbol also seems to be called a "bra."
yes, they are the same things in Wolfram quantum framework. Where you are referring to in this notebook (with potential mistake)?
Aren't the <x| forms usually called the "bras" and the |x> forms the "kets?" Or do you have them swapped on purpose?
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