Nuclear spin state narrowing via gate-controlled Rabi oscillations in a double quantum dot

被引：147

作者：

Klauser, D. ^{[1
]}

Coish, W. A. ^{[1
]}

Loss, Daniel ^{[1
]}

机构：

[1] Univ Basel, Dept Phys & Astron, CH-4056 Basel, Switzerland

来源：

PHYSICAL REVIEW B | 2006年 / 73卷 / 20期

关键词：

D O I：

10.1103/PhysRevB.73.205302

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study spin dynamics for two electrons confined to a double quantum dot under the influence of an oscillating exchange interaction. This leads to driven Rabi oscillations between the parallel to up arrow down arrow > state and the parallel to down arrow up arrow > state of the two-electron system. The width of the Rabi resonance is proportional to the amplitude of the oscillating exchange. A measurement of the Rabi resonance allows one to narrow the distribution of nuclear spin states and thereby to prolong the spin decoherence time. Further, we study decoherence of the two-electron states due to the hyperfine interaction and give requirements on the parameters of the system in order to initialize in the parallel to up arrow down arrow > state and to perform a root SWAP operation with unit fidelity.

引用

页数：12

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