Fast sensing of double-dot charge arrangement and spin state with a radio-frequency sensor quantum dot

被引：161

作者：

Barthel, C. ^{[1
]}

Kjaergaard, M. ^{[1
,2
]}

Medford, J. ^{[1
]}

Stopa, M. ^{[1
]}

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

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

Gossard, A. C.

机构：

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

[2] Univ Copenhagen, Niels Bohr Inst, Nanosci Ctr, DK-2100 Copenhagen, Denmark

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

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 16期

基金：

美国国家科学基金会;

关键词：

SINGLE-ELECTRON TRANSISTOR; COULOMB-BLOCKADE;

D O I：

10.1103/PhysRevB.81.161308

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Single-shot measurement of the charge arrangement and spin state of a double quantum dot are reported with measurement times down to 100 ns. Sensing uses radio-frequency reflectometry of a proximal quantum dot in the Coulomb blockade regime. The sensor quantum dot is up to 30 times more sensitive than a comparable quantum point-contact sensor and yields three times greater signal to noise in rf single-shot measurements. Numerical modeling is qualitatively consistent with experiment and shows that the improved sensitivity of the sensor quantum dot results from reduced lifetime broadening and screening.

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页数：4

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