Rapid Single-Shot Measurement of a Singlet-Triplet Qubit

被引：260

作者：

Barthel, C. ^{[1
]}

Reilly, D. J. ^{[1
,2
]}

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

Hanson, M. P. ^{[3
]}

Gossard, A. C. ^{[3
]}

机构：

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

[2] Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia

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

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 16期

关键词：

ELECTRON-SPIN; QUANTUM DOTS;

D O I：

10.1103/PhysRevLett.103.160503

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report repeated single-shot measurements of the two-electron spin state in a GaAs double quantum dot. The readout allows measurement with a fidelity above 90% with a similar to 7 mu s cycle time. Hyperfine-induced precession between singlet and triplet states of the two-electron system are directly observed, as nuclear Overhauser fields are quasistatic on the time scale of the measurement cycle. Repeated measurements on millisecond to second time scales reveal the evolution of the nuclear environment.

引用

页数：4

共 22 条

[1] Electrical control of spin relaxation in a quantum dot [J].