Harnessing the GaAs quantum dot nuclear spin bath for quantum control

Hugo Ribeiro, J. R. Petta, Guido Burkard

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

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 ∼1ns single spin rotations. We analyze the coherence of this spin qubit by considering the coupling to the nuclear spin bath and show that T2- ∼16ns, 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.

Original languageEnglish (US)
Article number115445
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number11
DOIs
StatePublished - Sep 24 2010

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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