Oct 11, 2001
Quantum Information Processing with Ferroelectrically Coupled Quantum Dots
Dr. Jeremy Levy, University of Pittsburgh
Quantum computers promise to exploit the fundamental laws of quantum
mechanics to produce staggering speedups of certain kinds of calculations.
However, the physical realization of quantum computers is still in its
infancy. In this talk, I will describe a proposal to construct a quantum
information processor using ferroelectrically coupled Ge/Si quantum dots.
The spin of single electrons form the fundamental qubits. Small (<10 nm
diameter) Ge quantum dots are optically excited to create spin polarized
electrons in Si. The static polarization of an epitaxial ferroelectric
thin film confines electrons laterally in the semiconductor; spin
interactions between nearest neighbor electrons are mediated by the
nonlinear process of optical rectification. Single qubit operations are
achieved through "g-factor engineering" in the Ge/Si structures; spin-spin
interactions occur through Heisenberg exchange, controlled by
ferroelectric gates. A method for reading out the final state may be
achieved using single electron transistors, as described by Kane et al.
Initial steps toward the realization such a system will also be described.
Audio for this talk requires sound hardware, and RealPlayer or RealAudio
Begin WebCam and audio for the whole talk: high bandwidth or medium bandwidth.
Or, begin audio only for the whole talk:
high bandwidth or low bandwidth.
(Or, right-click to download the whole audio file.)
To begin viewing slides, click on the first slide below.
(Or, view as pdf.)
Author entry (protected)