Tuesday, 21 November, 2006
Quantum Stochastic Synchronization
Igor Goychuk, Jesús Casado-Pascual, Manuel Morillo, Jörg Lehmann and Peter Hänggi -
Phys. Rev. Lett. 97, 210601 (2006)
We study, within the spin-boson dynamics, the synchronization of a quantum tunneling system with an external, time-periodic driving signal. As a main result, we find that at a sufficiently large system-bath coupling strength (i.e., for a friction strength a>1) the thermal noise plays a constructive role in yielding forced synchronization. This noise-induced synchronization can occur when the driving frequency is larger than the zero-temperature tunneling rate. As an application evidencing the effect, we consider the charge transfer dynamics in molecular complexes.