NOISE-INDUCED DETRAPPING IN SMALL QUANTUM NETWORKS

Optimizing excitation transport in quantum networks is an important precursor to the development of highly-efficient light-harvesting devices. We investigate the phenomenon of dephasing-assisted leakage from trapped states, which may ensure efficient transport of excitations across a network. We consider three small networks with known trapped states and study the effect of Markovian quantum noise and classical noise sources with different correlation times, from very low frequency non-Markovian noise to white noise. We show that the excitation - otherwise stalled in trapped states - is able to diffuse rapidly through the networks from a source to a sink, with efficiency being generally maximized for intermediate correlation times.