Working Beyond Moore's Limit - Coherent Nonlinear Optical Control of Individual and Coupled Single Electron Doped Quantum Dots

Abstract

Abstract : Work on this program was aimed at developing and understanding nano-optical structures with emphasis on developing quantum optical based devices. Specific work focused on semiconductor quantum dots. During this research period, a number of important discoveries were made as well as critical demonstrations of importance to future technology. The discoveries include (1) Measurement of dynamic nuclear spin polarization kinetics for fluctuation freezing, a result that extends the coherence time of the electron spin by over 2 orders of magnitude; (2) Design and demonstration of coherent optical control steps in preparation for deterministic spin-photon entanglement; (3) Demonstration of initialization of the 2 qubit states; (4) Demonstration of nonlocal nuclear spin freezing in quantum dot molecules; (5) Measurement of the Overhauser magnetic field distribution before and after fluctuation freezing; and (6) Demonstration of a flying qubit by entanglement of the quantum dot spin polarization with the polarization of a spontaneously emitted photon. Future work is focusing on use of cavity enhanced quantum dots for demonstration teleportation between information contained in a spontaneous photon down conversion source to a quantum dot spin.