2007/07/31 by K. C. Nowack, F. H. L. Koppens, Yu. V. Nazarov +1
Physics and Astronomy · #cond-mat.mes-hall
paper · pdf · doi:10.1126/science.1148092
published as Science 318, pp. 1430-1433 (2007) · Total 24 pages, 10 pages main text, 4 figures, 10 pages supplementary material
arxiv created 2008/03/10 · arxiv updated 2009/12/01
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.