Phase transition of the dissipative double-well quantum mechanics
  We investigate the critical dissipation of the double-well quantum mechanics. We adopt two-state approximation to define effective Ising models and apply the block decimation renormalization group and the finite range scaling method recently proposed for the long range Ising model. We briefly report the numerical results of the critical dissipation for various model parameters. 
Ken-Ichi Aoki and Tamao Kobayashi
cond-mat.stat-mech quant-ph