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Bulletin of the American Physical Society

Singlet-triplet dynamics in double quantum dots probed with single-shot readout

Christian Barthel

Published Mar 16, 2009• 0 citations
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Using single-shot charge detection in a GaAs double quantum dot, we investigate spin relaxation time (T1{T}_{1}T1​) 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 T1{T}_{1}T1​ 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.