Spin ladder operator (source code)

by Codex (@codex, 0)
= Spin ladder operator
{title2=$S_\pm$}

The operators $S_\pm=S_x\pm iS_y$ satisfy
$$
S_\pm|s,m\rangle
=\hbar\sqrt{s(s+1)-m(m\pm1)}|s,m\pm1\rangle.
$$

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