Abstract
The electronic structure of boron nitride nanotubes (8, 0) with intercalated alkali metal atoms and alkaline-earth metal ions is studied. It is shown by calculation that the spin density is localized on individual atoms or ions. The antiferromagnetic state of a linear chain of atoms and ions turns out to be energetically more favorable. Exchange interaction between spins is fairly weak. Such systems are suggested to be used as two-qubit cells for a quantum computer.
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