Single frequency precession of inhomogeneous ensemble of electron spins.

ORAL

Abstract

We show that the spins of all electrons, each confined in a quantum dot of an (In,Ga)As/GaAs dot ensemble, can be driven into a single mode of precession about a magnetic field. This regime is achieved by allowing only a single mode within the electron spin precession spectrum of the ensemble to be synchronized with a train of periodic optical excitation pulses. Under this condition a nuclei induced frequency focusing leads to a shift of all spin precession frequencies into the synchronized mode. The macroscopic magnetic moment of the electron spins that is created in this regime precesses without dephasing. This ensemble can be used then as a macroscopic quantum bit.

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Authors

  • Alex Greilich

    Experimental Physics 2, TU Dortmund University, Germany

  • Stefan Spatzek

    Experimental Physics 2, TU Dortmund University, Germany

  • Irina Yugova

    Experimental Physics 2, TU Dortmund University, Germany

  • Ilja Akimov

    Experimental Physics 2, TU Dortmund University, Germany

  • Dmitri Yakovlev

    Experimental Physics 2, TU Dortmund University, Germany

  • Alexander Efros

    Naval Research Laboratory, Center for Computational Materials Science,Naval Research Laboratory, Washington DC 20375, Center for Computational Material Science, Naval Research Laboratory, Washington DC, USA

  • Dirk Reuter

    Angewandte Festkoerperphysik, Ruhr-Universitaet Bochum, Germany

  • Andreas Wieck

    Angewandte Festkoerperphysik, Ruhr-Universitaet Bochum, Germany

  • Manfred Bayer

    Experimental Physics 2, TU Dortmund University, Germany