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  • Title: Coherent manipulation of coupled electron spins in semiconductor quantum dots.
    Author: Petta JR, Johnson AC, Taylor JM, Laird EA, Yacoby A, Lukin MD, Marcus CM, Hanson MP, Gossard AC.
    Journal: Science; 2005 Sep 30; 309(5744):2180-4. PubMed ID: 16141370.
    Abstract:
    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 approximately 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.
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