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Originally published in Science Express on 1 September 2005
Science 30 September 2005:
Vol. 309. no. 5744, pp. 2180 - 2184
DOI: 10.1126/science.1116955
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Research Articles

Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots

J. R. Petta,1 A. C. Johnson,1 J. M. Taylor,1 E. A. Laird,1 A. Yacoby,2 M. D. Lukin,1 C. M. Marcus,1 M. P. Hanson,3 A. C. Gossard3

We demonstrated coherent control of a quantum two-level system based on two-electron spin states in a double quantum dot, allowing state preparation, coherent manipulation, and projective readout. These techniques are based on rapid electrical control of the exchange interaction. Separating and later recombining a singlet spin state provided a measurement of the spin dephasing time, T2*, of ~10 nanoseconds, limited by hyperfine interactions with the gallium arsenide host nuclei. Rabi oscillations of two-electron spin states were demonstrated, and spin-echo pulse sequences were used to suppress hyperfine-induced dephasing. Using these quantum control techniques, a coherence time for two-electron spin states exceeding 1 microsecond was observed.

1 Department of Physics, Harvard University, Cambridge, MA 02138, USA.
2 Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
3 Materials Department, University of California at Santa Barbara, Santa Barbara, CA 93106, USA.

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