The possibility of realizing simple single-electron logic gates (where information is stored in spins of individual electrons) by means of arrays of tunnel-coupled quantum dots with strong intradot Coulomb interaction is considered. The exact diagonalization technique for the spin-1/2 Heisenberg model is used to analyze quantum dot structures realizing a number of the simplest logic gates (NOT, AND, NAND, OR, NOR, NXOR, and half-adder). It is shown that for all gates considered the entire truth table can be obtained by choosing appropriate values of the local magnetic fields at the dots which are regarded as the gate inputs.
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