Relaxation and readout visibility of a singlet-triplet qubit in an Overhauser field gradient

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Relaxation and readout visibility of a singlet-triplet qubit in an Overhauser field gradient

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Title: Relaxation and readout visibility of a singlet-triplet qubit in an Overhauser field gradient
Author: Barthel, C; Medford, James Redding; Bluhm, H.; Yacoby, Amir; Marcus, C; Hanson, M. P.; Gossard, A. C.

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Citation: Barthel, C., J. Medford, H. Bluhm, A. Yacoby, C. M. Marcus, M. P. Hanson, and A. C. Gossard. 2012. “Relaxation and Readout Visibility of a Singlet-Triplet Qubit in an Overhauser Field Gradient.” Phys. Rev. B 85 (3) (January).
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Abstract: Using single-shot charge detection in a GaAs double quantum dot, we investigate spin relaxation time (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 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.
Published Version: doi:10.1103/physrevb.85.035306
Other Sources: http://arxiv.org/pdf/1108.4210.pdf
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12111382
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