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We study the elliptic spin-1/2 Kondo model (spin-1/2 fermions in onedimension with fully anisotropic contact interactions with a magnetic impurity)in the light of mappings to bosonic systems using the fermion-bosoncorrespondence and associated unitary transformations. We show that for fixedfermion number, the bosonic system describes a two-level quantum dissipativesystem with two noninteracting copies of infinitely-degenerate upper and lowerlevels. In addition to the standard tunnelling transitions, and the transitionsdriven by the dissipative coupling, there are also bath-mediated transitionsbetween the upper and lower states which simultaneously effect shifts in thehorizontal degeneracy label. We speculate that these systems could provide newexamples of continuous time quantum random walks, which are exactly solvable.

Extended two-level quantum dissipative system from bosonization of the elliptic spin-1/2 Kondo model