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

被引：51

作者：

Barthel, C. ^{[1
]}

Medford, J. ^{[1
]}

Bluhm, H. ^{[1
]}

Yacoby, A. ^{[1
]}

Marcus, C. M. ^{[1
]}

Hanson, M. P. ^{[2
]}

Gossard, A. C. ^{[2
]}

机构：

[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[2] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 03期

基金：

美国国家科学基金会;

关键词：

SPIN;

D O I：

10.1103/PhysRevB.85.035306

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 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.

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页数：7

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