\documentclass[12pt]{article}
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\begin{document}
\begin{equation*}
|\psi_{out}\rangle=
U_\gamma\,|\psi_{in}\rangle,\, U_\gamma=\oplus_{l=1}^R e^{i\,\phi_l}\,\Gamma_{A_l}(\gamma),
\end{equation*}
\end{document}