Download or read book Optically Controlled Quantum Dot Spins for Scaleable Quantum Computing written by and published by . This book was released on 2005 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this program has been to work towards development of spin based quantum dots for optically driven quantum information processing. Using a combination of ultrahigh resolution laser spectroscopy to study the physics of the dots and ultrafast laser technology to coherently control the spins, we made several advances. Our main achievements include working with a model system based on the exciton optical Bloch vector where we demonstrated the first solid state quantum logic device and made the first demonstration of quantum state tomography in a solid. We also were successful in taking the new quantum dot structures produced by our collaborator, Dan Gammon at NRL that contained one electron, and demonstrated optically induced and detected quantum spin coherence and coherent optical control of the spin state. Our high resolution measurements also provided a measurement of the spin relaxation rate. The funding level in this program was primarily to support one graduate student and purchase equipment. The remaining support for the work comes from ARO, NSA (formerly ARDA), AFOSR, NSF.