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Reilly DJ, Taylor JM, Laird EA, et al. Measurement of temporal correlations of the overhauser field in a double quantum dot. Phys Rev Lett. 2008;101(23):236803doi: 10.1103/PhysRevLett.101.236803.
Reilly, D. J., Taylor, J. M., Laird, E. A., Petta, J. R., Marcus, C. M., Hanson, M. P., & Gossard, A. C. (2008). Measurement of temporal correlations of the overhauser field in a double quantum dot. Physical review letters, 101(23), 236803. https://doi.org/10.1103/PhysRevLett.101.236803
Reilly, D J, et al. "Measurement of temporal correlations of the overhauser field in a double quantum dot." Physical review letters vol. 101,23 (2008): 236803. doi: https://doi.org/10.1103/PhysRevLett.101.236803
Reilly DJ, Taylor JM, Laird EA, Petta JR, Marcus CM, Hanson MP, Gossard AC. Measurement of temporal correlations of the overhauser field in a double quantum dot. Phys Rev Lett. 2008 Dec 05;101(23):236803. doi: 10.1103/PhysRevLett.101.236803. Epub 2008 Dec 04. PMID: 19113577.
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Phys Rev Lett. 2008 Dec 05;101(23):236803. doi: 10.1103/PhysRevLett.101.236803. Epub 2008 Dec 04.

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

Physical review letters

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

Affiliations

  1. Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

PMID: 19113577 DOI: 10.1103/PhysRevLett.101.236803

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 approximately 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.

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