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\section{Directions to explore}  \begin{itemize}  \item \subsection{  Stochastic resonance. resonance}  Here is an article on quantum stochastic resonance \cite{L_fstedt_1994} \item \subsection{  Measurements of energy barriers.  \item barriers}.  \subsection{  Vortex manipulations. manipulations}  \end{itemize}