Decoherence-free quantum-information processing using dipole-coupled qubits

We propose a quantum-information processor that consists of decoherence-free logical qubits encoded into arrays of dipole-coupled qubits. High-fidelity single-qubit operations are performed deterministically within a decoherence-free subsystem without leakage via global addressing of bichromatic laser fields. Two-qubit operations are realized locally with four physical qubits, and between separated logical qubits using linear optics. We show how to prepare cluster states using this method. We include all non-nearest-neighbor effects in our calculations, and we assume the qubits are not located in the Dicke limit. Although our proposal is general to any system of dipole-coupled qubits, throughout the paper we use nitrogen-vacancy (NV) centers in diamond as an experimental context for our theoretical results.Comment: 7 pages, 5 figure

FAK-Src signalling is important to renal collecting duct morphogenesis: discovery using a hierarchical screening technique

Summary This report describes a hierarchical screening technique for identification of pathways that control the morphogenesis of the renal collecting duct system. The multi-step screen involves a first round using a 2-dimensional, cell-line-based scrape-healing assay, then a second round using a 3-dimensional tubulogenesis assay; both of these rounds use new cell lines described in this report. The final stage is ex vivo organ culture. We demonstrate the utility of the screen by using it to identify the FAK–Src-pathway signalling as being important for collecting duct development, specifically for the cell proliferation on which this development depends

Simulation of dynamic recrystallization using irregular cellular automata

Computer simulation is a powerful tool to predict microstructure and its evolution during dynamic recrystallization. Cellular Automata (CA), as one of the most efficient methods proposed to simulate recrystallization and grain growth. In this work, recrystallization and grain growth phenomena were modelled by using a two dimensional irregular CA method. Initial grain size, nuclei density and orientation of each grain were variables which have been used as entering data to the CA model. Final grain size, orientation of each grain, dislocation density and stress-strain curve were the results which have been resulted to validate the current model. Considering the model assumptions, it is shown that the CA can successfully simulate dynamic recrystallization

Differential translocation of Salmonella serovars to mesenteric lymph nodes of pigs

In observational studies of growing pigs in North Carolina, we cultured paired samples of mesenteric lymph nodes (MLN) and cecal contents for Salmonella using standard methods for selective enrichment and plating. Apparent Salmonella prevalence was higher among cecal (39.2%) than MLN (20.5%) samples from the same animals. Salmonella Typhimurium var. Copenhagen (STC) and S. Derby comprised 84% of all isolates at slaughter. For these two serovars we found an association between serovar and sample type. The odds of isolating STC from MLN rather than cecum were 5.7 (95%CI 3.0 to 10.7) times higher than the odds for S. Derby. The odds for isolating STC from MLN versus cecum were 58 times higher for groups where STC had been isolated from the pigs on farm than for groups where it was had not been detected on farm. These findings suggest biological differences among common group B Salmonella serovars in the pig

Improvement and Taste Symmetry Breaking for Staggered Quarks

We compare several improved actions for staggered quarks. We study the effect of improvement on the taste changing interactions by calculating the splitting in the pion spectrum. We investigate the effect of the improvement on some topological properties.Comment: 3 pages, 3 figures, Lattice 2003 proceeding