Coherent adiabatic spin control in the presence of charge noise using tailored pulses

Hugo Ribeiro, Guido Burkard, J. R. Petta, H. Lu, A. C. Gossard

Research output: Contribution to journalArticle

36 Scopus citations

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.

Original languageEnglish (US)
Article number086804
JournalPhysical review letters
Volume110
Issue number8
DOIs
StatePublished - Feb 21 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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