Dresden 2014 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 6: Statistical Physics far from Thermal Equilibrium - Part II
DY 6.6: Vortrag
Montag, 31. März 2014, 16:45–17:00, ZEU 160
Observable most probable trajectories of quantum switching in modulated oscillator — •Vittorio Peano1 and Mark Dykman2 — 1Friedrich Alexander Universität Erlangen — 2Michigan State University
Quantum fluctuations lead to a finite width of the distribution of a modulated system over its quasienergy (Floquet) states even for zero temperature of the bath to which the system is coupled. We study the resulting distribution for a periodically modulated oscillator. Of special interest are large rare fluctuations responsible for the tail of the distribution over quasienergy and for switching between metastable states of forced vibrations. We find the most probable paths followed by the quasienergy in rare events, including switching. Along with the switching rates, such paths are observable characteristics of quantum fluctuations. As we show, they can change discontinuously once the detailed balance condition is broken (leading to the quantum crossover discussed in [1]). Knowledge of such paths suggests a new way of quantum control of rare events.
[1] see M. Marthaler contribution