Inhomogeneous quantum diffusion and decay of a meta-stable state
  We consider the quantum stochastic dynamics of a system whose interaction with the reservoir is considered to be linear in bath co-ordinates but nonlinear in system co-ordinates. The role of the space-dependent friction and diffusion has been examined in the decay rate of a particle from a meta-stable well. We show how the decay rate can be hindered by inhomogeneous dissipation due nonlinear system-bath coupling strength. 
Pulak Kumar Ghosh, Debashis Barik and Deb Shankar Ray