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Published Online November 1, 2007
Science DOI: 10.1126/science.1148092

Reports

Submitted on July 20, 2007
Accepted on October 16, 2007

Coherent Control of a Single Electron Spin with Electric Fields

K. C. Nowack 1{dagger}*, F. H. L. Koppens 1{dagger}, Yu. V. Nazarov 1, L. M. K. Vandersypen 1*

1 Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands.

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

{dagger}These authors contributed equally to this work.

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 90° rotations as fast as ~55 ns. 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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Science. ISSN 0036-8075 (print), 1095-9203 (online)