Approaching Landauer's Bound In A Spin-Encoded Quantum Computer

TL;DR

This paper experimentally verifies that the Landauer bound can be approached in a spin-encoded quantum computer, demonstrating near-quantitative erasure efficiency through quantum spin tunneling in a single-spin system.

Contribution

It provides the first experimental verification of approaching Landauer's bound in a spin-based quantum system using optical manipulation.

Findings

Achieved 79.3% approach to Landauer's bound via quantum spin tunneling.

Designed an optically manipulated spin-encoded quantum computer.

Experimentally verified the energy bound for spin qubit erasure.

Abstract

It is commonly recognized that the Landauer bound holds in (irreversible) quantum operations. In this study, we verified this bound by extracting a single spin from a spin-spin magnetic interaction experiment to demonstrate that the Landauer bound can be approached quantitatively with an approaching rate of 79.3 percent via quantum spin tunneling. An optically manipulated spin-encoded quantum computer is designed, in which energy bound near kB T to erase a spin qubit is theoretically sensible and experimentally verified. This work may represent the last piece of the puzzle in quantum Landauer erasure in terms of a single spin being the smallest information carrier.