2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/22837Dark soliton (DS) and Josephson vortex (JV) in quasi-1D long Bose Josephson junction (BJJ) can be interconverted by tuning Josephson coupling. Rates of the interconversion as well as of the thermally activated phase-slip effect, resulting in the JV switching its vorticity, have been evaluated. The role of quantum phase-slip in creating superposition of JVs with opposite vorticities as a qubit is discussed as well. Utilization of the JV for controlled and coherent transfer of atomic Bose-Einstein condensate (BEC) is suggested.4 pages, 2 figures, revtex4. This is a revised version: results of numerical simulations and 1 figure are addedSoft Condensed Mattertext