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  • Title: Electron spin dephasing due to hyperfine interactions with a nuclear spin bath.
    Author: Cywiński L, Witzel WM, Das Sarma S.
    Journal: Phys Rev Lett; 2009 Feb 06; 102(5):057601. PubMed ID: 19257553.
    Abstract:
    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 approximately 10 mT, allowing for comparison with recent experiments in GaAs quantum dots.
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