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

Author(s): Ribeiro, Hugo; Burkard, Guido; Petta, Jason R; Lu, H; Gossard, AC

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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 T-2* using a tailored pulse with a detuning dependent level velocity. Our results show an improvement of a factor of similar to 2.9 for the oscillation visibility. In particular, we were able to obtain a visibility of similar to 0.5 for Stuckelberg oscillations, which demonstrates the creation of an equally weighted superposition of the qubit states. DOI: 10.1103/PhysRevLett.110.086804
Publication Date: 22-Feb-2013
Electronic Publication Date: 21-Feb-2013
Citation: Ribeiro, Hugo, Burkard, Guido, Petta, JR, Lu, H, Gossard, AC. (2013). Coherent Adiabatic Spin Control in the Presence of Charge Noise Using Tailored Pulses. PHYSICAL REVIEW LETTERS, 110 (10.1103/PhysRevLett.110.086804
DOI: doi:10.1103/PhysRevLett.110.086804
ISSN: 0031-9007
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW LETTERS
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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