Coherent control of a single electron spin with electric fields

Details Coherent control of a single electron spin with electric fields Coherent control of a single electron spin with electric fields

2007-07-20

arxiv.org/abs/0707.3080v2

Science 318, pp. 1430-1433 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Total 24 pages, 10 pages main text, 4 figures, 10 pages supplementary material

Scientific paper

10.1126/science.1148092

Manipulation of single spins is essential for spin-based quantum information processing. Electrical control instead of magnetic control is particularly appealing for this purpose, since electric fields are easy to generate locally on-chip. We experimentally realize coherent control of a single electron spin in a quantum dot using an oscillating electric field generated by a local gate. The electric field induces coherent transitions (Rabi oscillations) between spin-up and spin-down with pi/2 rotations as fast as ~55ns. Our analysis indicates that the electrically-induced spin transitions are mediated by the spin-orbit interaction. Taken together with the recently demonstrated coherent exchange of two neighboring spins, our results demonstrate the feasibility of fully electrical manipulation of spin qubits.

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