A Bennett clocked spin wire. (a) Ground state of an array of nearest-neighbor exchange coupled dots forming a “spin wire;” (b) the th spin is flipped and a tie results between the th, ()th and ()th spins; (c) the ()th and ()th spins are rotated to the right by ~90° with external potentials applied selectively to these two dots which resolves the tie; (d) the potential is withdrawn from the ()th dot, whose resident spin flips down because of unequal exchange interactions with the right and left neighbors, while the spin in the ()th dot is rotated by ~90° by a potential applied to that dot; (e) the potential from the ()th dot is withdrawn, resulting in the host spin flipping up; (f) “fan out” operation via a bifurcated spin wire (the gate pads between the dots are not shown here for clarity).
