Spin detection at elevated temperatures using a driven double quantum dot

TL;DR

This paper demonstrates a method for detecting a nearby single spin at elevated temperatures using a driven double quantum dot, which acts as a sensitive spin meter via microwave-induced resonances.

Contribution

The study introduces a spin detection scheme that operates at high temperatures and analyzes the conditions for non-demolition spin read-out in a double quantum dot system.

Findings

Resonances in electron occupations depend on the nearby spin state.

The spin meter functions effectively at temperatures comparable to the charging energy.

Sensitivity is primarily limited by intradot spin relaxation.

Abstract

We consider a double quantum dot in the Pauli blockade regime interacting with a nearby single spin. We show that under microwave irradiation the average electron occupations of the dots exhibit resonances that are sensitive to the state of the nearby spin. The system thus acts as a spin meter for the nearby spin. We investigate the conditions for a non-demolition read-out of the spin and find that the meter works at temperatures comparable to the dot charging energy and sensitivity is mainly limited by the intradot spin relaxation.