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We present a proposal for a one-bit full-adder to process classicalinformation based on the quantum reversible dynamics of a triple quantum dotsystem. The device works via the repeated execution of a Fredkin gateimplemented through the dynamics of a single time-independent Hamiltonian. Ourproposal uses realistic parameter values and could be implemented on currentlyavailable quantum dot architectures. We compare the estimated energyrequirements for operating our full-adder with those of well-known fullyclassical devices, and argue that our proposal may provide a consistentlybetter energy efficiency. Our work serves as a proof of principle for thedevelopment of energy-efficient information technologies operating throughcoherent quantum dynamics.

Quantum dynamics for energetic advantage in a charge-based classical full-adder