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Coherent Adiabatic Spin Control in the Presence of Charge Noise Using Tailored Pulses

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2013

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Petta, Jason R.
Lu, Hong
Gossard, Arthur C.

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http://nbn-resolving.de/urn:nbn:de:bsz:352-248049
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https://doi.org/10.1103/PhysRevLett.110.086804
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Physical Review Letters. 2013, 110(8). ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.110.086804

Zusammenfassung

We study finite-time Landau-Zener transitions at a singlet-triplet level crossing in a GaAs double quantum dot, both experimentally and theoretically. Sweeps across the anticrossing in the high driving speed limit result in oscillations with a small visibility. Here we demonstrate how to increase the oscillation visibility while keeping sweep times shorter than T2* using a tailored pulse with a detuning dependent level velocity. Our results show an improvement of a factor of -2.9 for the oscillation visibility. In particular, we were able to obtain a visibility of -0.5 for Stückelberg oscillations, which demonstrates the creation of an equally weighted superposition of the qubit states.

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ISO 690RIBEIRO, Hugo, Guido BURKARD, Jason R. PETTA, Hong LU, Arthur C. GOSSARD, 2013. Coherent Adiabatic Spin Control in the Presence of Charge Noise Using Tailored Pulses. In: Physical Review Letters. 2013, 110(8). ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.110.086804
BibTex
@article{Ribeiro2013Coher-24804,
  year={2013},
  doi={10.1103/PhysRevLett.110.086804},
  title={Coherent Adiabatic Spin Control in the Presence of Charge Noise Using Tailored Pulses},
  number={8},
  volume={110},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Ribeiro, Hugo and Burkard, Guido and Petta, Jason R. and Lu, Hong and Gossard, Arthur C.}
}
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