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Coherent quantum phase slip in two-component bosonic atomtronic circuits
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Coherent quantum phase slip consists in the coherent transfer of vortices in superfluids. We investigate this phenomenon in two miscible coherently coupled components of a spinor Bose gas confined in a toroidal trap. After imprinting different vortex states, i.e. states with quantized circulation, on each component, we demonstrate that during the whole dynamics the system remains in a linear superposition of two current states in spite of the nonlinearity, and can be mapped onto a linear Josephson problem. We propose this system as a good candidate for the realization of a Mooij-Harmans qubit and remark its feasibility for implementation in current experiments with 87Rb, since we have used values for the physical parameters currently available in laboratories.
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GALLEMÍ PAULET, Jaume, MUÑOZ MATEO, Antonio, MAYOL SÁNCHEZ, Ricardo, GUILLEUMAS, Montserrat. Coherent quantum phase slip in two-component bosonic atomtronic circuits. _New Journal of Physics_. 2016. Vol. 18, núm. 015003. [consulta: 15 de gener de 2026]. ISSN: 1367-2630. [Disponible a: https://hdl.handle.net/2445/100686]