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Tunneling vortex dynamics in linearly coupled Bose-Hybbard rings Escrivà, Albert Muñoz Mateo, Antonio Guilleumas, Montserrat Juliá-Díaz, Bruno Vòrtexs Superfluïdesa Condensació de Bose-Einstein Vortex-motion Superfluidity Bose-Einstein condensation The quantum dynamics of population-balanced fractional vortices and population-imbalanced vortices in an effective two-state bosonic system, made of two coupled discrete circuits with few sites, is addressed within the Bose-Hubbard model. We show that, for low on-site interaction, the tunneling of quantized vortices between the rings performs a coherent, oscillating dynamics connecting current states with chiral symmetry. The vortex-flux transfer dually follows the usual sinusoidal particle current of the Josephson effect, in good agreement with a mean-field approximation. Within such a regime, the switch of persistent currents in the rings resembles flux-qubit features and is feasible for experimental realization. On the contrary, strong interatomic interactions suppress the chiral current and lead the system into fragmented condensation. 2020-01-22T14:27:54Z 2020-01-22T14:27:54Z 2019-12-09 2020-01-22T14:27:54Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1103/PhysRevA.100.063621 Physical Review A, 2019, vol. 100, p. 063621 https://doi.org/10.1103/PhysRevA.100.063621 (c) American Physical Society, 2019 info:eu-repo/semantics/openAccess American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)