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Measurement of Temporal Correlations of the Overhauser Field in a Double Quantum Dot

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  • D. J. Reilly
  • J M Taylor
  • E. A. Laird
  • J R Petta
  • C M Marcus
  • M P Hanson
  • A C Gossard
Article number236803
<mark>Journal publication date</mark>1/12/2008
<mark>Journal</mark>Physical review letters
Issue number23
Number of pages4
Publication StatusPublished
<mark>Original language</mark>English


In quantum dots made from materials with nonzero nuclear spins, hyperfine coupling creates a fluctuating effective Zeeman field (Overhauser field) felt by electrons, which can be a dominant source of spin qubit decoherence. We characterize the spectral properties of the fluctuating Overhauser field in a GaAs double quantum dot by measuring correlation functions and power spectra of the rate of singlet-triplet mixing of two separated electrons. Away from zero field, spectral weight is concentrated below 10 Hz, with

dependence on frequency
. This is consistent with a model of nuclear spin diffusion, and indicates that decoherence can be largely suppressed by echo techniques.