We present a new way of continuously reading-out the state of a single electronic spin. Our detection scheme is based on an exchange interaction between the electronic spin and a nearby read-out quantum dot. The coupling between the two systems results in a spin-dependent conductance through the read-out dot and establishes an all electrical and non-destructive single spin detection. With conductance variations up to 4% and read-out fidelities greater than 99.5%, this method represents an alternative to systems where spin to charge conversion cannot be implemented. Using a semi-classical approach, we present an asymetric exchange coupling model in good agreement with our experimental results.
@article{arxiv.1705.02125,
title = {Electrical single spin read-out using an exchange-coupled quantum dot},
author = {Clément Godfrin and Stefan Thiele and Karim Ferhat and Svetlana Klyatskaya and Mario Ruben and Wolfgang Wernsdorfer and Franck Balestro},
journal= {arXiv preprint arXiv:1705.02125},
year = {2017}
}