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Originally published in Science Express on 1 November 2007
Science 30 November 2007:
Vol. 318. no. 5855, pp. 1430 - 1433
DOI: 10.1126/science.1148092
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Reports

Coherent Control of a Single Electron Spin with Electric Fields

K. C. Nowack,*{dagger} F. H. L. Koppens,{dagger} Yu. V. Nazarov, L. M. K. Vandersypen*

Manipulation of single spins is essential for spin-based quantum information processing. Electrical control instead of magnetic control is particularly appealing for this purpose, because electric fields are easy to generate locally on-chip. We experimentally realized coherent control of a single-electron spin in a quantum dot using an oscillating electric field generated by a local gate. The electric field induced coherent transitions (Rabi oscillations) between spin-up and spin-down with 90° rotations as fast as ~55 nanoseconds. Our analysis indicated that the electrically induced spin transitions were mediated by the spin-orbit interaction. Taken together with the recently demonstrated coherent exchange of two neighboring spins, our results establish the feasibility of fully electrical manipulation of spin qubits.

Kavli Institute of Nanoscience, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, the Netherlands.

{dagger} These authors contributed equally to this work.

* To whom correspondence should be addressed. E-mail: k.c.nowack{at}tudelft.nl, l.m.k.vandersypen{at}tudelft.nl

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