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Science 21 July 2006:
Vol. 313. no. 5785, pp. 341 - 345
DOI: 10.1126/science.1128215
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Reports

Mode Locking of Electron Spin Coherences in Singly Charged Quantum Dots

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

The fast dephasing of electron spins in an ensemble of quantum dots is detrimental for applications in quantum information processing. We show here that dephasing can be overcome by using a periodic train of light pulses to synchronize the phases of the precessing spins, and we demonstrate this effect in an ensemble of singly charged (In,Ga)As/GaAs quantum dots. This mode locking leads to constructive interference of contributions to Faraday rotation and presents potential applications based on robust quantum coherence within an ensemble of dots.

1 Experimentelle Physik II, Universität Dortmund, D-44221 Dortmund, Germany.
2 A. F. Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia.
3 Naval Research Laboratory, Washington, DC 20375, USA.
4 School of Computational Sciences, George Mason University, Fairfax, VA 22030, USA.
5 Institute of Physics, St. Petersburg State University, 198504, St. Petersburg, Russia.
6 Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany.

* To whom correspondence should be addressed. E-mail: dmitri.yakovlev{at}physik.uni-dortmund.de (D.R.Y.); efros{at}dave.nrl.navy.mil (Al.L.E.); manfred.bayer{at}physik.unidortmund.de (M.B.)

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
A Coherent Single-Hole Spin in a Semiconductor.
D. Brunner, B. D. Gerardot, P. A. Dalgarno, G. Wust, K. Karrai, N. G. Stoltz, P. M. Petroff, and R. J. Warburton (2009)
Science 325, 70-72
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Nuclei-Induced Frequency Focusing of Electron Spin Coherence.
A. Greilich, A. Shabaev, D. R. Yakovlev, Al. L. Efros, I. A. Yugova, D. Reuter, A. D. Wieck, and M. Bayer (2007)
Science 317, 1896-1899
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