2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/99473We calculate the Landauer conductance through chaotic ballistic devices in the semiclassical limit, to all orders in the inverse number of scattering channels without and with a magnetic field. Families of pairs of entrance-to-exit trajectories contribute, similarly to the pairs of periodic orbits making up the small-time expansion of the spectral form factor of chaotic dynamics. As a clue to the exact result we find that close self-encounters slightly hinder the escape of trajectories into leads.5 pages, 1 figureMesoscale and Nanoscale PhysicsChaotic Dynamicstext