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

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

2007-12-24

arxiv.org/abs/0712.4033v3

Phys. Rev. Lett. 101, 236803 (2008).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

related papers available at http://marcuslab.harvard.edu

Scientific paper

10.1103/PhysRevLett.101.236803

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/f^2 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.

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