The calculation of rate coefficients is a discipline of nonlinear science of importance to much
of physics, chemistry, engineering, and biology. Fifty years after Kramers' seminal paper on …

Many important processes in science involve the escape of a particle over a barrier. In this
review, we report, extend, and interpret various theories of noise-activated escape. We …

Experiments to investigate the quantum behavior of a macroscopic degree of freedom,
namely the phase difference across a Josephson tunnel junction, are described. The …

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We present accurate fully quantum calculations of thermal rate constants for a symmetric
double well system coupled to a dissipative bath. The calculations are performed using the …

With this work we elaborate on the physics of quantum noise in thermal equilibrium and in
stationary nonequilibrium. Starting out from the celebrated quantum fluctuation-dissipation …

We investigate quantum Brownian motion in adiabatically rocked ratchet systems. Above a
crossover temperature T c tunneling events are rare, yet they already substantially enhance …

The decay of a metastable state of a system coupled to a heat-bath environment is studied.
A functional-integral method is presented allowing for the calculation of decay rates at finite …

Measurements of the tunneling rate Γ out of the zero-voltage state for several Nb edge
junctions with differing shunt capacitances are described. At zero temperature, increasing …

We have found a novel feature of the bistable large-spin model described by the
Hamiltonian H=− DS z 2− H x S x. The crossover from thermal to quantum regime for the …