Semi-classical model for the dephasing of a two-electron spin qubit coupled to a coherently evolving nuclear spin bath

Details Semi-classical model for the dephasing of a two-electron spin qubit coupled to a coherently evolving nuclear spin bath Semi-classical model for the dephasing of a two-electron spin qubit coupled to a coherently evolving nuclear spin bath

2011-03-24

arxiv.org/abs/1103.4862v2

Phys. Rev. B 84, 035441 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 Pages, some equations were corrected; Published July 27, 2011

Scientific paper

10.1103/PhysRevB.84.035441

We study electron spin decoherence in a two-electron double quantum dot due to the hyperfine interaction, under spin-echo conditions as studied in recent experiments. We develop a semi-classical model for the interaction between the electron and nuclear spins, in which the time-dependent Overhauser fields induced by the nuclear spins are treated as classical vector variables. Comparison of the model with experimentally-obtained echo signals allows us to quantify the contributions of various processes such as coherent Larmor precession and spin diffusion to the nuclear spin evolution.

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