underbrace in the ket symbol makes it be enlarged in a bad way

Question

I have used:
underbrace{ket{0..0}}_{N}

and it results in

When I use ket{underbrace{0..0}_{N}} I have

Both of them are undesired!!! I just want to have the first symbol but with N be in the ket as:

How can I reach that?

campa · Accepted Answer

The physics package loves automatic scaling, which is one the
reasons why I don't like it. Anyway, it provides a starred version with no automatic scaling.
documentclass{article}
usepackage{physics}
begin{document}
$ket*{underbrace{0..0}_{N}}$ vs. $ket{underbrace{0..0}_{N}}$
end{document}

Alternatively you can use the braket package; personally I define ket with DeclarePairedDelimiter from mathtools.

underbrace in the ket symbol makes it be enlarged in a bad way

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