Electron spin manipulation and resonator readout in a double quantum dot nano-electromechanical system

TL;DR

This paper proposes a method to manipulate and read out a single electron spin in a double quantum dot system by coupling it magnetically to a nano-mechanical resonator, enabling frequency detection through charge measurements.

Contribution

It introduces a novel approach for spin control and resonator frequency readout using magnetic coupling in a double quantum dot system.

Findings

Selective electron spin flipping at resonance conditions

Resonator frequency can be inferred from charge state measurements

Potential for quantum information applications

Abstract

Magnetically coupling a nano-mechanical resonator to a double quantum dot confining two electrons can enable the manipulation of a single electron spin and the readout of the resonator's natural frequency. When the Larmor frequency matches the resonator frequency, the electron spin in one of the dots can be selectively flipped by the magnetised resonator. By simultaneously measuring the charge state of the two-electron double quantum dots, this transition can be detected thus enabling the natural frequency of the mechanical resonator to be determined.