For several years now quantum computing has been viewed as a new paradigm for certain computing applications. Of particular importance to this burgeoning field is the development of an algorithm for factoring large numbers which obviously has deep implications for cryptography and national security. Implementation of these theoretical ideas faces extraordinary challenges in preparing and manipulating quantum states. The quantum transport group at Sandia has demonstrated world-leading, unique double quantum wires devices where we have unprecedented control over the coupling strength, number of 1 D channels, overlap and interaction strength in this nanoelectronic system. In this project, we study 1D-1D tunneling with the ultimate aim of preparing and detecting quantum states of the coupled wires. In a region of strong tunneling, electrons can coherently oscillate from one wire to the other. By controlling the velocity of the electrons, length of the coupling region and tunneling strength we will attempt to observe tunneling oscillations. This first step is critical for further development double quantum wires into the basic building block for a quantum computer, and indeed for other coupled nanoelectronic devices that will rely on coherent transport. If successful, this project will have important implications for nanoelectronics, quantum computing and information technology.
The trajectory and entrainment properties of a transverse jet are important to a variety of engineering applications. This study seeks to develop actuation strategies that manipulate the penetration, spread, and vortical structures of the tranverse jet, based on simple vorticity perturbations at the nozzle edge. We use three-dimensional vortex simulations of a transverse jet at high Reynolds number to examine four prototypical actuations, all at a jet-to-crossflow velocity ratio of r = 7. These actuations include a delta-tab on the windward edge of the jet nozzle as well as periodic modulations and inversions of wall-normal vorticity in the shear layer. Small modifications to the vorticity on nascent shear layer are found to have a significant impact on the jet evolution - creating jets that remain confined and penetrate further into the crossflow, or, alternately, jets that quickly spread in the spanwise direction and bend downstream. Vorticity perturbations also hasten or delay the formation of counter-rotating vorticity by modifying the folding of shear-layer segments.
Annual groundwater sampling was conducted at the Sandia National Laboratories' Mixed Waste Landfill (MWL) in April 2005. Seven monitoring wells were sampled using a Bennett{trademark} pump in accordance with the April 2005 Mini-Sampling and Analysis Plan for the MWL (SNL/NM 2005). The samples were analyzed off site at General Engineering Laboratories, Inc. for a broad suite of radiochemical and chemical parameters, and the results are presented in this report. Sample splits were also collected from several of the wells by the New Mexico Environment Department U.S. Department of Energy Oversight Bureau; however, the split sample results are not included in this report. The results of the April 2005 annual groundwater monitoring conducted at the MWL showed constituent concentrations within the historical ranges for the site and indicated no evidence of groundwater contamination from the landfill.
This meeting will continue to cover fundamentals and applications of photoionization and photodetachment, including valence and core-level phenomena and applications to reaction dynamics, ultrashort laser pulses and the study of exotic molecules and anions.