Some new theory related to Landau-Zener transitions in the presence of a spin bath.
Link included in the sidebar. Here’s the title & abstract:
We study the effect of an environment consisting of noninteracting two level systems on Landau-Zener (LZ) transition probability in the small gap regime. We show that if the environment is initially at zero temperature, it does not affect the transition probability. An excited environment, however, always increases the probability of making an LZ transition. We find an upper bound for the transition probability in the limit of large number of environmental spins. We show that for adiabatic quantum computation, the environment suppresses the probability of success by at most a factor close to 1/2.