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

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.

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• Theory of electron spin decoherence by interacting nuclear spins in a quantum dot
• Fast Single-Charge Sensing with an rf Quantum Point Contact
• Dynamic Nuclear Polarization with Single Electron Spins
• Large nuclear Overhauser fields detected in vertically-coupled double quantum dots
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