Electron spin coherence in semiconductors: Considerations for a spin-based solid state quantum computer architecture
Mesoscale and Nanoscale Physics
2009-11-07 v3 Quantum Physics
Abstract
We theoretically consider coherence times for spins in two quantum computer architectures, where the qubit is the spin of an electron bound to a P donor impurity in Si or within a GaAs quantum dot. We show that low temperature decoherence is dominated by spin-spin interactions, through spectral diffusion and dipolar flip-flop mechanisms. These contributions lead to 1-100 s calculated spin coherence times for a wide range of parameters, much higher than former estimates based on measurements.
Cite
@article{arxiv.cond-mat/0203101,
title = {Electron spin coherence in semiconductors: Considerations for a spin-based solid state quantum computer architecture},
author = {Rogerio de Sousa and S. Das Sarma},
journal= {arXiv preprint arXiv:cond-mat/0203101},
year = {2009}
}
Comments
Role of the dipolar interaction clarified; Included discussion on the approximations employed in the spectral diffusion calculation. Final version to appear in Phys. Rev. B