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Science 28 September 2007:
Vol. 317. no. 5846, pp. 1896 - 1899
DOI: 10.1126/science.1146850
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Reports

Nuclei-Induced Frequency Focusing of Electron Spin Coherence

A. Greilich,1* A. Shabaev,2,3* D. R. Yakovlev,1,4 Al. L. Efros,2{dagger} I. A. Yugova,1,5 D. Reuter,6 A. D. Wieck,6 M. Bayer1{dagger}

The hyperfine interaction of an electron with the nuclei is considered as the primary obstacle to coherent control of the electron spin in semiconductor quantum dots. We show, however, that the nuclei in singly charged quantum dots act constructively by focusing the electron spin precession about a magnetic field into well-defined modes synchronized with a laser pulse protocol. In a dot with a synchronized electron, the light-stimulated fluctuations of the hyperfine nuclear field acting on the electron are suppressed. The information about electron spin precession is imprinted in the nuclei and thereby can be stored for tens of minutes in darkness. The frequency focusing drives an electron spin ensemble into dephasing-free subspaces with the potential to realize single frequency precession of the entire ensemble.

1 Experimentelle Physik II, Universität Dortmund, D-44221 Dortmund, Germany.
2 Naval Research Laboratory, Washington, DC 20375, USA.
3 School of Computational Sciences, George Mason University, Fairfax, VA 22030, USA.
4 A. F. Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia.
5 Institute of Physics, St. Petersburg State University, 1908504 St. Petersburg, Russia.
6 Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: efros{at}dave.nrl.navy.mil; manfred.bayer{at}physik.unidortmund.de

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Suppressing Spin Qubit Dephasing by Nuclear State Preparation.
D. J. Reilly, J. M. Taylor, J. R. Petta, C. M. Marcus, M. P. Hanson, and A. C. Gossard (2008)
Science 321, 817-821
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Science. ISSN 0036-8075 (print), 1095-9203 (online)