Optical Spin Initialization and Nondestructive Measurement in a Quantum Dot Molecule

Abstract

The spin of an electron in a self-assembled InAs=GaAs quantum dot molecule is optically prepared and measured through the trion triplet states. A longitudinal magnetic field is used to tune two of the trion states into resonance, forming a superposition state through asymmetric spin exchange. As a result, spinflip Raman transitions can be used for optical spin initialization, while separate trion states enable cycling transitions for nondestructive measurement. With two-laser transmission spectroscopy we demonstrate both operations simultaneously, something not previously accomplished in a single quantum dot.

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Document Details

Document Type
Technical Report
Publication Date
Dec 02, 2008
Accession Number
ADA549962

Entities

People

  • Allan S. Bracker
  • Daniel Gammon
  • Danny Kim
  • Mark Bashkansky
  • Michael Scheibner
  • Sophia E. Economou
  • Thomas L. Reinecke
  • Ştefan C. Bǎdescu

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Couplings
  • Detectors
  • Diagrams
  • Energy Levels
  • Ground State
  • Magnetic Fields
  • Materials
  • Measurement
  • Molecules
  • Nuclear Spins
  • Quantum Computing
  • Quantum Dots
  • Quantum Information
  • Quantum Properties
  • Spectra
  • Spin States
  • Spin-Orbit Interaction

Fields of Study

  • Physics

Readers

  • Molecular Photonics/Laser Physics
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.

Technology Areas

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