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Harnessing the GaAs quantum dot nuclear spin bath for quantum control

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2010

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Petta, Jason R.

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http://nbn-resolving.de/urn:nbn:de:bsz:352-124427
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https://doi.org/10.1103/PhysRevB.82.115445
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Physical Review B. 2010, 82(11). ISSN 1098-0121. Available under: doi: 10.1103/PhysRevB.82.115445

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We theoretically demonstrate that nuclear spins can be harnessed to coherently control two-electron spin states in a double quantum dot. Hyperfine interactions lead to an avoided crossing between the spin singlet state and the ms=+1 triplet state, T+. We show that a coherent superposition of singlet and triplet states can be achieved using finite-time Landau-Zener-Stückelberg interferometry. In this system the coherent rotation rate is set by the Zeeman energy, resulting in ∼1 ns single spin rotations. We analyze the coherence of this spin qubit by considering the coupling to the nuclear spin bath and show that T2∗∼16 ns, in good agreement with experimental data. Our analysis further demonstrates that efficient single qubit and two-qubit control can be achieved using Landau-Zener-Stückelberg interferometry.

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ISO 690RIBEIRO, Hugo, Jason R. PETTA, Guido BURKARD, 2010. Harnessing the GaAs quantum dot nuclear spin bath for quantum control. In: Physical Review B. 2010, 82(11). ISSN 1098-0121. Available under: doi: 10.1103/PhysRevB.82.115445
BibTex
@article{Ribeiro2010Harne-12442,
  year={2010},
  doi={10.1103/PhysRevB.82.115445},
  title={Harnessing the GaAs quantum dot nuclear spin bath for quantum control},
  number={11},
  volume={82},
  issn={1098-0121},
  journal={Physical Review B},
  author={Ribeiro, Hugo and Petta, Jason R. and Burkard, Guido}
}
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