A quantum dot single spin meter
Abstract
We present the theory of a single spin meter consisting of a quantum dot in a magnetic field under microwave irradiation combined with a charge counter. We show that when a current is passed through the dot, a change in the average occupation number occurs if the microwaves are resonant with the on-dot Zeeman splitting. The width of the resonant change is given by the microwave-induced Rabi frequency, making the quantum dot a sensitive probe of the local magnetic field and enabling the detection of the state of a nearby spin. If the dot-spin and the nearby spin have different g-factors, a non-demolition readout of the spin state can be achieved. The conditions for a reliable spin readout are found.
Citation
Wabnig , J & Lovett , B W 2009 , ' A quantum dot single spin meter ' , New Journal of Physics , vol. 11 , 043031 . https://doi.org/10.1088/1367-2630/11/4/043031
Publication
New Journal of Physics
Status
Peer reviewed
ISSN
1367-2630Type
Journal article
Rights
© 2009 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 3.0) license, which permits others to distribute, remix, adapt and build upon this work, for commercial use, provided the original work is properly cited
Description
We thank the QIPIRC (GR/S82176/01) for support. BWL thanks the Royal Society for support through a University Research Fellowship. JW thanks the Wenner-Gren Foundations for financial support.Collections
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