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Relaxation and Readout Visibility of a Singlet-Triplet Qubit in an Overhauser Field Gradient

Using single-shot charge detection in a GaAs double quantum dot, we investigate spin relaxation time T_1 and readout visibility of a two-electron singlet-triplet qubit following single-electron dynamic nuclear polarization (DNP). For magnetic fields up to 2 T, the DNP cycle is in all cases found to increase Overhauser field gradients, which in turn decrease T_1 and consequently reduce readout visibility. This effect was previously attributed to a suppression of singlet-triplet dephasing under a similar DNP cycle. A model describing relaxation after singlet-triplet mixing agrees well with experiment. Effects of pulse bandwidth on visibility are also investigated.

preprint2011arXivOpen access
C. BarthelJ. MedfordH. BluhmA. YacobyC. M. MarcusM. P. HansonA. C. Gossard
cond-mat.mes-hallquant-ph
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C. BarthelJ. MedfordH. BluhmA. YacobyC. M. MarcusM. P. HansonA. C. Gossard

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