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

Hugo Ribeiro, Guido Burkard, J. R. Petta, H. Lu, and A. C. Gossard
Phys. Rev. Lett. 110, 086804 – Published 21 February 2013
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Abstract

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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  • Received 12 July 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.086804

© 2013 American Physical Society

Authors & Affiliations

Hugo Ribeiro1, Guido Burkard1, J. R. Petta2,3, H. Lu4, and A. C. Gossard4

  • 1Department of Physics, University of Konstanz, D-78457 Konstanz, Germany
  • 2Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
  • 3Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Princeton, New Jersey 08544, USA
  • 4Materials Department, University of California at Santa Barbara, Santa Barbara, California 93106, USA

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Vol. 110, Iss. 8 — 22 February 2013

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