Research output: Contribution to journal › Journal article
|Journal publication date||11/04/2011|
|Journal||Physical review letters|
|Number of pages||4|
We demonstrate single-shot readout of a silicon quantum dot spin qubit, and we measure the spin relaxation time T-1. We show that the rate of spin loading can be tuned by an order of magnitude by changing the amplitude of a pulsed-gate voltage, and the fraction of spin-up electrons loaded can also be controlled. This tunability arises because electron spins can be loaded through an orbital excited state. Using a theory that includes excited states of the dot and energy-dependent tunneling, we find that a global fit to the loading rate and spin-up fraction is in good agreement with the data.