  In the traditional random-conformational-search model, various hypotheses
with a series of meta-stable intermediate states were often proposed to resolve
the Levinthal paradox. Here we introduce a quantum strategy to formulate
protein folding as a quantum walk on a definite graph, which provides us a
general framework without making hypotheses. Evaluating it by the mean of first
passage time, we find that the folding time via our quantum approach is much
shorter than the one obtained via classical random walks. This idea is expected
to evoke more insights for future studies.
