Boosted-speed coherent exciton propagation in multirail transmission lines
Phys. Rev. A 114, 033511 – Published 14 September, 2026
DOI: https://doi.org/10.1103/ddyr-fyzr
Abstract
Coherent exciton transport in dye aggregates is degraded by molecular vibrations, resulting in short exciton dephasing times and limited coherent pulse travel distances. However, in the race against decoherence, this travel distance can be extended if conditions are found that permit faster pulse propagation, which, in turn, may facilitate applications in exciton-based quantum information processing. We compute the exciton dispersion relations for several transmission architectures to identify those possessing modes with the greatest group velocity. We find that transmission lines consisting of multiple coupled linear assemblies are capable of exciton propagation velocities that exceed those of a single-line transmission line. The best of these exhibited a maximum group velocity roughly double that of a single-row transmission line with comparable nearest-neighbor dye couplings. As a first effort to focus on what can be achieved under ideal circumstances in short transmission lines, the effects of both environmental fluctuations and static disorder have been neglected.
