Best way to do bra-kets in latex?

[LAHLH]

Hi,

sorry if this is the wrong place, but is there a good way to do bras and kets in latex. I usually just do \mid 0\rangle but this gives big gaps that doesn't look very professional

 

[Hurkyl]

You can use | directly, as in $|0\rangle$.

 

[LAHLH]

cheers

 

[Fredrik]

The distance can come out wrong when you use | too. Apparently it doesn't when the next symbol is 0, but it does when the next symbol is \uparrow, as you can see here: $|\uparrow\rangle$. Then you can use \left| to get $\left|\uparrow\rangle$. I'm too lazy to type \left every time though.

 

[Hurkyl]

Interestingly, \mid works with \uparrow.

Anyways, You can always subtract spacing yourself with \!. For example, using mid and 0:
$$\mid \!\! 0 \rangle$$
and, you can always make a definition to abbreviate stuff, although that doesn't work as well on PF:

$$\def\ket#1{\left | #1 \right \rangle} \ket{0} \qquad \ket{\uparrow} \qquad \ket{\frac{1}{2}}$$