Wigner crystals of ions as quantum hard drives

Atomic systems in regular lattices are intriguing systems for implementing ideas in quantum simulation and information processing. Focusing on laser cooled ions forming Wigner crystals in Penning traps, we find a robust and simple approach to engineering non-trivial 2-body interactions sufficient for universal quantum computation. We then consider extensions of our approach to the fast generation of large cluster states, and a non-local architecture using an asymmetric entanglement generation procedure between a Penning trap system and well-established linear Paul trap designs.Comment: 5 pages, 4 figure

Trying to restrict her range: The backlash in response to Ree Drummond, “The Pioneer Woman,” and Drummond’s agency in constructing and profiting from a 21st century pioneering persona

Ree Drummond is the creator of the wildly popular lifestyle blog, thepioneerwoman.com, and star of the Food Network show, “The Pioneer Woman.” This thesis analyzes the rhetorical practices of Ree Drummond, as “The Pioneer Woman,” and how critics’ responses to this constructed persona have taken shape on blogging platforms. To conduct this analysis, I examined a variety of artifacts from Drummond’s public persona including her blog, cookbooks, television episodes, as well as YouTube videos of her public appearances and speaking engagements. I also analyzed the forums in which people respond to “The Pioneer Woman”; this includes op-eds on the Internet, blogs such as The Pioneer Woman Sux, commenting forums, and independent academic pieces such as a dissertation. Overall, this project discovered that blogging is a medium that people turn to for self-expression and community; a space in which ordinary people can feel a sense of belonging. Thus, the backlash surrounding the rhetorical practices of Ree Drummond suggests that critics do not identify with the Pioneer Woman persona that she is constructing because they do not recognize the text and images that Drummond conveys online and onscreen, as being congruent to their idea of what a “real” pioneer woman should look like. To express their feelings of “estrangement” as Kenneth Burke would say, critics utilize the “medium of ordinary people” in order to challenge whether Drummond’s representation of an extraordinary lifestyle is evidence of “real” country living. In questioning Drummond’s authenticity, critics’ comments suggest an inaccurate perception that the blogging genre is capable of revealing unfiltered reality, as well as an ambivalence about Drummond’s worthiness of the label “Pioneer Woman” due to historical perceptions of 19th century pioneer women as hardworking, manual laborers. However, it is unfair to compare Drummond to her frontier ancestors, as in this process critics dismiss her intellectual labor as a professional blogger. Therefore, ultimately, this works calls for a re-conceptualization of the definition of a pioneer, to acknowledge Drummond’s successful utilization of modern-day technological tools that resulted in a lucrative brand based off her lived experiences as a wife and mother living on a cattle ranch

Balancing Design Options with Sherpa

Application specific processors offer the potential of rapidly designed logic specifically constructed to meet the performance and area demands of the task at hand. Recently, there have been several major projects that attempt to automate the process of transforming a predetermined processor configuration into a low level description for fabrication. These projects either leave the specification of the processor to the designer, which can be a significant engineering burden, or handle it in a fully automated fashion, which completely removes the designer from the loop. In this paper we introduce a technique for guiding the design and optimization of application specific processors. The goal of the Sherpa design framework is to automate certain design tasks and provide early feedback to help the designer navigate their way through the architecture design space. Our approach is to decompose the overall problem of choosing an optimal architecture into a set of sub-problems that are, to the first order, independent. For each subproblem, we create a model that relates performance to area. From this, we build a constraint system that can be solved using integer-linear programming techniques, and arrive at an ideal parameter selection for all architectural components. Our approach only takes a few minutes to explore the design space allowing the designer or compiler to see the potential benefits of optimizations rapidly. We show that the expected performance using our model correlates strongly to detailed pipeline simulations, and present results showing design tradeoffs for several different benchmarks

Effects of Bedrock Landsliding on Cosmogenically Determined Erosion Rates

The successful quantification of long-term erosion rates underpins our understanding of landscape. formation, the topographic evolution of mountain ranges, and the mass balance within active orogens. The measurement of in situ-produced cosmogenic radionuclides (CRNs) in fluvial and alluvial sediments is perhaps the method with the greatest ability to provide such long-term erosion rates. In active orogens, however, deep-seated bedrock landsliding is an important erosional process, the effect of which on CRN-derived erosion rates is largely unquantified. We present a numerical simulation of cosmogenic nuclide production and distribution in landslide-dominated catchments to address the effect of bedrock landsliding on cosmogenic erosion rates in actively eroding landscapes. Results of the simulation indicate that the temporal stability of erosion rates determined from CRN concentrations in sediment decreases with increased ratios of landsliding to sediment detachment rates within a given catchment area, and that larger catchment areas must be sampled with increased frequency of landsliding in order to accurately evaluate long-term erosion rates. In addition, results of this simulation suggest that sediment sampling for CRNs is the appropriate method for determining long-term erosion rates in regions dominated by mass-wasting processes, while bedrock surface sampling for CRNs is generally an ineffective means of determining long-term erosion rates. Response times of CRN concentrations to changes in erosion rate indicate that climatically driven cycles of erosion may be detected relatively quickly after such changes occur, but that complete equilibration of CRN concentrations to new erosional conditions may take tens of thousands of years. Simulation results of CRN erosion rates are compared with a new, rich dataset of CRN concentrations from the Nepalese Himalaya, supporting conclusions drawn from the simulation