Spin qubit gates via phonon buses in electron nanowires

TL;DR

This paper proposes a method for scalable quantum computing using electron nanowires to mediate spin interactions between distant quantum dots via virtual phonons, achieving strong coupling in GaAs systems.

Contribution

It introduces a novel phonon-mediated coupling mechanism in electron nanowires for quantum dot interactions, expanding scalable quantum computing architectures.

Findings

Coupling strengths over 30 MHz in GaAs quantum dots.

Effective spin-spin interaction mediated by virtual phonons.

Potential for scalable quantum computing architectures.

Abstract

Scalable architectures for quantum computing using semiconductor quantum dots require interactions between qubits beyond adjacent quantum dots. Here, we propose using nanowires of electrons to mediate the interaction between two quantum dots. Virtual phonons in the linear chain of electrons can mediate an interaction that gives rise to effective spin-spin coupling of the electrons in distant quantum dots. We find coupling strengths of more than 30 MHz for experimentally realisable parameters in GaAs quantum dots.