  We study the protein folding problem on the base of the quantum approach we
proposed recently by considering the model of protein chain with nine
amino-acid residues. We introduced the concept of distance space and its
projections on a $XY$-plane, and two characteristic quantities, one is called
compactness of protein structure and another is called probability ratio
involving shortest path. Our results not only confirmed the fast quantum
folding time but also unveiled the existence of quantum intelligence hidden
behind in choosing protein folding pathways.
