A quantum dot single spin meter
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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.
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
New Journal of Physics
DescriptionWe 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.
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