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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
Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots
J. R. Petta,1A. C. Johnson,1J. M. Taylor,1E. A. Laird,1A. Yacoby,2M. D. Lukin,1C. M. Marcus,1M. P. Hanson,3A. C. Gossard3
We demonstrated coherent control of a quantum two-level systembased on two-electron spin states in a double quantum dot, allowingstate preparation, coherent manipulation, and projective readout.These techniques are based on rapid electrical control of theexchange interaction. Separating and later recombining a singletspin state provided a measurement of the spin dephasing time,T2*, of 10 nanoseconds, limited by hyperfine interactions withthe gallium arsenide host nuclei. Rabi oscillations of two-electronspin states were demonstrated, and spin-echo pulse sequenceswere used to suppress hyperfine-induced dephasing. Using thesequantum control techniques, a coherence time for two-electronspin 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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David P. DiVincenzo (30 September 2005) Science309 (5744), 2173.
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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. 
