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

Reilly, D. J. and Taylor, J M and Laird, E. A. and Petta, J R and Marcus, C M and Hanson, M P and Gossard, A C (2008) Measurement of Temporal Correlations of the Overhauser Field in a Double Quantum Dot. Physical review letters, 101 (23). ISSN 0031-9007

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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 / 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.

Item Type:
Journal Article
Journal or Publication Title:
Physical review letters
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
124372
Deposited By:
Deposited On:
04 Apr 2018 10:48
Refereed?:
Yes
Published?:
Published
Last Modified:
12 Aug 2020 07:16