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Weak values of electron spin in a double quantum dot

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Article number056801
<mark>Journal publication date</mark>5/02/2008
<mark>Journal</mark>Physical review letters
Issue number5
Publication StatusPublished
<mark>Original language</mark>English


We propose a protocol for a controlled experiment to measure a weak value of the electron's spin in a solid state device. The weak value is obtained by a two step procedure-weak measurement followed by a strong one (postselection), where the outcome of the first measurement is kept provided a second postselected outcome occurs. The setup consists of a double quantum dot and a weakly coupled quantum point contact to be used as a detector. Anomalously large values of the spin of a two electron system are predicted, as well as negative values of the total spin. We also show how to incorporate the adverse effect of decoherence into this procedure.