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

TL;DR

This paper proposes a quantum dot-based full-adder that leverages quantum reversible dynamics to potentially achieve better energy efficiency than classical counterparts, serving as a proof of principle for quantum-enabled energy-efficient information processing.

Contribution

It introduces a quantum full-adder design using a triple quantum dot system with a single Hamiltonian, demonstrating potential energy advantages over classical devices.

Findings

Potential for improved energy efficiency compared to classical full-adders

Implementation feasibility with current quantum dot technology

Proof of principle for quantum-coherent information processing

Abstract

We present a proposal for a one-bit full-adder to process classical information based on the quantum reversible dynamics of a triple quantum dot system. The device works via the repeated execution of a Fredkin gate implemented through the dynamics of a single time-independent Hamiltonian. Our proposal uses realistic parameter values and could be implemented on currently available quantum dot architectures. We compare the estimated energy requirements for operating our full-adder with those of well-known fully classical devices, and argue that our proposal may provide a consistently better energy efficiency. Our work serves as a proof of principle for the development of energy-efficient information technologies operating through coherent quantum dynamics.