Scaling and Suppression of Anomalous Heating in Ion Traps

We measure and characterize anomalous motional heating of an atomic ion confined in the lowest quantum levels of a novel rf ion trap that features moveable electrodes. The scaling of heating with electrode proximity is measured, and when the electrodes are cooled from 300 to 150 K, the heating rate is suppressed by an order of magnitude. This provides direct evidence that anomalous motional heating of trapped ions stems from microscopic noisy potentials on the electrodes that are thermally driven. These observations are relevant to decoherence in quantum information processing schemes based on trapped ions and perhaps other charge-based quantum systems

A Workshop to Incorporate Language Development in Teaching Reading

It is the purpose of this paper to describe a workshop designed to teach elementary school teachers how to incorporate language development activities during reading instruction, particularly with children who have language-based reading difficulties

Planar Ion Trap Geometry for Microfabrication

We describe a novel high aspect ratio radiofrequency linear ion trap geometry that is amenable to modern microfabrication techniques. The ion trap electrode structure consists of a pair of stacked conducting cantilevers resulting in confining fields that take the form of fringe fields from parallel plate capacitors. The confining potentials are modeled both analytically and numerically. This ion trap geometry may form the basis for large scale quantum computers or parallel quadrupole mass spectrometers. PACS: 39.25.+k, 03.67.Lx, 07.75.+h, 07.10+CmComment: 14 pages, 16 figure

An Informal Reading--Language Test

Professionals working with children who need help in language development and reading have reported a positive relationship between reading performance and the development of language skills (Mattingly, 1972; Goodm3n, reported in Gutknecht and Keenan, 1978; Berger, 1978; Semel and Wiig, 1975; Stark, 1975). Semel and Wiig (1975) report that many reading problems are due to a child I s difficulty or inability to understand the ideas being expressed by complex syntactic structures, and Rupley (1974) states that problems in understanding the vocabulary used in reading texts may contribute to reading problems. The relationship and parallelism between reading and language development becomes more evident when considering some of the the correlates that can have an effect on either or both of them: auditory or visual preceptual problems; motivation. Although such correlates are not synonymous with etiologies for poor developmental reading skills, they are conditions often accompanying an inability to read (Kirk, Kliebhan and Lerner, 1978)

An Integrative Reading-Language Approach

This study sought to determine whether third-grade children identified as poor readers (6-12 mos. delay) were able to improve their reading performances after being provided instruction using an integrated reading-language approach. It was speculated that the basis for some or most reading difficulties were language problems resulting from deficiencies in constructing meaning from a spoken or printed message, difficulty understanding and/or remembering the message proposition(s), and incongruities between a child\u27s knowledge of language and linguistic information presented

Integrating Language Activities into Reading Instruction

This study determines if second grade children, who have been identified as having possible listening comprehension problems and language deficiencies, demonstrate improved reading performance with an integrated reading-language treatment approach. A quasi-experimental design included sixteen children in the experimental group and nineteen subjects in the control group. Six operationally defined language behaviors were studied during eleven weeks of treatment. the data were interpreted to imply that certain aspects of an integrative reading-language approach were effective for reading instruction

T-junction ion trap array for two-dimensional ion shuttling, storage and manipulation

We demonstrate a two-dimensional 11-zone ion trap array, where individual laser-cooled atomic ions are stored, separated, shuttled, and swapped. The trap geometry consists of two linear rf ion trap sections that are joined at a 90 degree angle to form a T-shaped structure. We shuttle a single ion around the corners of the T-junction and swap the positions of two crystallized ions using voltage sequences designed to accommodate the nontrivial electrical potential near the junction. Full two-dimensional control of multiple ions demonstrated in this system may be crucial for the realization of scalable ion trap quantum computation and the implementation of quantum networks.Comment: 3 pages, 5 figure

Bright Source of Cold Ions for Surface-Electrode Traps

We produce large numbers of low-energy ions by photoionization of laser-cooled atoms inside a surface-electrode-based Paul trap. The isotope-selective trap loading rate of $4\times10^{5}$ Yb$^{+}$ ions/s exceeds that attained by photoionization (electron impact ionization) of an atomic beam by four (six) orders of magnitude. Traps as shallow as 0.13 eV are easily loaded with this technique. The ions are confined in the same spatial region as the laser-cooled atoms, which will allow the experimental investigation of interactions between cold ions and cold atoms or Bose-Einstein condensates.Comment: Paper submitted to PRL for review on 2/1/0