  Based on the understanding that chemical bonds can act as tunnel junctions in
the Coulomb blockade regime, and on the technical ability to coat a DNA strand
with metal, we suggest that DNA can be used to built logical devices. We
discuss two explicit examples: a Single Electron Tunneling Transistor (SET) and
a Quantum Bit Element. These devices would be literally in the nano-meter scale
and would be able to operate at room temperature. In addition they would be
identical to each other, highly stable and would have a self assembly property.
