Electron Spin Dephasing due to Hyperfine Interactions with a Nuclear Spin Bath

被引：274

作者：

Cywinski, Lukasz ^{[1
]}

Witzel, Wayne M. ^{[2
]}

Das Sarma, S. ^{[1
]}

机构：

[1] Univ Maryland, Dept Phys, Condensed Matter Theory Ctr, College Pk, MD 20742 USA

[2] USN, Res Lab, Washington, DC 20375 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 05期

关键词：

QUANTUM DOTS; DECOHERENCE;

D O I：

10.1103/PhysRevLett.102.057601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate pure dephasing decoherence (free induction decay and spin echo) of a spin qubit interacting with a nuclear spin bath. While for infinite magnetic field B the only decoherence mechanism is spectral diffusion due to dipolar flip-flops of nuclear spins, with decreasing B the hyperfine-mediated interactions between the nuclear spins become important. We give a theory of decoherence due to these interactions which takes advantage of their long-range nature. For a thermal uncorrelated bath we show that our theory is applicable down to B similar to 10 mT, allowing for comparison with recent experiments in GaAs quantum dots.

引用

页数：4

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