Spin decoherence in quantum dots

被引：0

作者：

Rao, D. D. Bhaktavatsala ^{[1
]}

Ravishankar, V. ^{[1
]}

Subrahmanyam, V. ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Phys, Kanpur 208016, Uttar Pradesh, India

来源：

QUANTUM COMPUTING: BACK ACTION 2006 | 2006年 / 864卷

关键词：

spin decoherence; Heisenberg interaction; spin polarization; quantum dots;

D O I：

暂无

中图分类号：

TP301 [理论、方法];

学科分类号：

081202 ;

摘要：

The decoherence of a spin-1/2 particle (qubit) interacting with a nuclear spin bath in quantum dots has been studied using an isotropic Heisenberg model. An effective magnetic field (a feature of unitary evolution) and an effective temperature (a non-unitary feature) describe the effective dynamics of the qubit. The decoherence time scale is calculated as a function of the nuclear bath spin distribution and the nuclear polarizations in various spin channels. The averaged auto correlation function of the qubit spin, averaged over all possible initial states of the qubit, depends on the nuclear spin distribution, but is insensitive to the nuclear polarizations.

引用

页码：104 / +

页数：2

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