\documentclass[preview, border=40px]{standalone}
\usepackage{../quantumcubemodel}
\begin{document}
\begin{qcmx}
    \qcmxO{0.71}
    \qcmxI{0.71}
    \qcmxRenderQ
    \qcmxClearQ

    \node at (15,0,0) {\huge$\otimes$};

    \qcmxO{0.5}
    \qcmxI{0.87}
    \def\qcmxOffsetX{20}
    \def\qcmxOffsetY{-5}
    \def\qcmxOrientationQ{y}
    \qcmxRenderQ
    \qcmxClearQ

    \node at (10,-5,0) {\Huge$=$};
    
    \qcmxOO{0.35}
    \qcmxOI{0.59}
    \qcmxIO{0.35}
    \qcmxII{0.59}
    \def\qcmxOffsetX{5}
    \def\qcmxOffsetY{-18}
    \qcmxRenderQQ
\end{qcmx}
\end{document}