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.
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