Coherent manipulation of coupled electron spins in semiconductor quantum dots

  • Petta J
  • Johnson A
  • Taylor J
 et al. 
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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, T(2), of similar to 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.

Author-supplied keywords

  • blockade
  • computation
  • coulomb
  • system

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Authors

  • JR Petta

  • AC Johnson

  • JM Taylor

  • EA Laird

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