Optical Control of Coherent Interactions between Electron Spins in InGaAs Quantum Dots

Abstract

Coherent interactions between spins in quantum dots are a key requirement for quantum gates. We have performed pump-probe experiments in which pulsed lasers emitting at different photon energies manipulate two distinct subsets of electron spins within an inhomogeneous InGaAs quantum dot ensemble. The spin dynamics are monitored through their precession about an external magnetic field. These measurements demonstrate spin precession phase shifts and modulations of the magnitude of one subset of oriented spins after optical orientation of the second subset. The observations are consistent with results from a model using a Heisenberg-like interaction with (mu)eV strength.

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Document Details

Document Type
Technical Report
Publication Date
Sep 21, 2011
Accession Number
ADA554789

Entities

People

  • A. D. Wieck
  • A. Greilich
  • A. Schwan
  • D. R. Yakovlev
  • D. Reuter
  • M. Bayer
  • S. Spatzek
  • S. Varwig
  • Sophia E. Economou
  • T. L. Reinecke

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Circular Polarization
  • Electrons
  • Laser Pulses
  • Magnetic Fields
  • Materials
  • Military Research
  • Orientation (Direction)
  • Phase Shift
  • Photoluminescence
  • Polarization
  • Precession
  • Quantum Bits
  • Quantum Dots
  • Quantum Information
  • Quantum Properties
  • Rotation
  • Time Dependence

Fields of Study

  • Physics

Readers

  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.

Technology Areas

  • Directed Energy
  • Microelectronics
  • Quantum Computing
  • Quantum Science - Quantum Dots