Measurement of temporal correlations of the overhauser field in a double quantum dot

D. J. Reilly, J. M. Taylor, E. A. Laird, J. R. Petta, C. M. Marcus, M. P. Hanson, A. C. Gossard

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84 Scopus citations

Abstract

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 ∼1/f2 dependence on frequency f. This is consistent with a model of nuclear spin diffusion, and indicates that decoherence can be largely suppressed by echo techniques.

Original languageEnglish (US)
Article number236803
JournalPhysical review letters
Volume101
Issue number23
DOIs
StatePublished - Dec 4 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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