Quantum effects in classical chaos through intermittency
  The semi-quantal dynamics is applied to investigate the influence of quantum fluctuations on problems in classical chaos through intermittency involving bifurcations. The results of the numerical calculations indicate that quantum effects enhance the tendency to chaos in both the problems of inverted pitchfork and saddle-node bifurcations discussed here. 
T. S. Nag and P. Banerjee
cond-mat.other nlin.CD quant-ph