Electron spin coherence in semiconductors: Considerations for a spin-based solid state quantum computer architecture

Details Electron spin coherence in semiconductors: Considerations for a spin-based solid state quantum computer architecture Electron spin coherence in semiconductors: Considerations for a spin-based solid state quantum computer architecture

2002-03-05

arxiv.org/abs/cond-mat/0203101v3

Phys. Rev. B 67, 033301 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Role of the dipolar interaction clarified; Included discussion on the approximations employed in the spectral diffusion calcul

Scientific paper

10.1103/PhysRevB.67.033301

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 $\mu$s calculated spin coherence times for a wide range of parameters, much higher than former estimates based on $T_{2}^{*}$ measurements.

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