  Motivated by the fact that the low-energy properties of the Kondo model can
be effectively simulated in spin chains, we study the realization of the effect
with bond impurities in ultracold bosonic lattices at half-filling. After
presenting a discussion of the effective theory and of the mapping of the
bosonic chain onto a lattice spin Hamiltonian, we provide estimates for the
Kondo length as a function of the parameters of the bosonic model. We point out
that the Kondo length can be extracted from the integrated real space
correlation functions, which are experimentally accessible quantities in
experiments with cold atoms.
