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Petta, J. R; Johnson, A. C; Taylor, J. M; Laird, E. A; Yacoby, A; Lukin, M. D; Marcus, C. M; Hanson, M. P; Gossard, A. C
Science, 09/2005, Volume: 309, Issue: 5744Journal Article
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 approximately10 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.
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