Weak values of electron spin in a double quantum dot

Details Weak values of electron spin in a double quantum dot Weak values of electron spin in a double quantum dot

2007-07-25

arxiv.org/abs/0707.3695v3

Phys. Rev. Lett. 100, 056801 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4+ pages, 3 figures, final published version

Scientific paper

10.1103/PhysRevLett.100.056801

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 (post-selection), where the outcome of the first measurement is kept provided a second post-selected outcome occurs. The set-up 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.

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