Home > Research > Publications & Outputs > Measurement of Temporal Correlations of the Ove...

Associated organisational unit

Links

Text available via DOI:

View graph of relations

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

Research output: Contribution to journalJournal article

Published
  • D. J. Reilly
  • J M Taylor
  • E. A. Laird
  • J R Petta
  • C M Marcus
  • M P Hanson
  • A C Gossard
Close
Article number236803
<mark>Journal publication date</mark>1/12/2008
<mark>Journal</mark>Physical review letters
Issue number23
Volume101
Number of pages4
Publication StatusPublished
<mark>Original language</mark>English

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.