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School of Physics

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End date: 2012 × Start date: 2010 × Item Type: Publication × search.filters.applied.f.isOrgUnitOfPublicationTitle: College of Sciences × search.filters.applied.f.isOrgUnitOfPublicationTitle: Undergraduate Research Opportunities Program ×

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Now showing 1 - 5 of 5
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An FPGA-based microarchitecture for the implementation of quantum gates with trapped ions

2012-12-18 , Nichols, Charles Spencer

Quantum computing promises to revolutionize computing by providing exponential speed improvements to classically difficult problems. Over the past 30 years, experimental research has progressed from manipulating quantum systems to creating elementary gates in many quantum mechanical systems. One of the most successful media for implementing quantum gates is trapped ions. Current trapped-ion quantum computing architectures have very high gate fidelities and long coherence times, but creating quantum gates with low error rates with trapped ions is challenging since it requires precise trap and laser control. In order to implement quantum gates with trapped ions, I have created a field-programmable-gate-array- (FPGA) based microarchitecture for constructing laser-pulse sequences and controlling ancillary equipment. The microarchitecture is centralized to minimize experimental timing errors and is programmable to provide the generality necessary for implementing a vast range of experiments.

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Scaler System Testing in the HAWC Experiment

2010-05-12 , Browning, Tyler

TeV gamma rays probe the non-thermal Universe in ways that are not possible at other wavelengths. The HAWC observatory, under construction in Mexico, will be able to analyze and survey the TeV sky more completely than any competing detectors that use air Cherenkov techniques, and perhaps yield new insight onto the nature of cosmic accelerators responsible for gamma ray bursts, active galactic nuclei flares, and other cataclysmic astrophysical events. Before it's deployment, one of HAWC's electronic data acquisition systems, the scaler system, will be tested using a pulse generator. The pulse generator's capabilities are assessed and documented.

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The effects of fecl3 intercalation on the optical properties of multilayer epitaxial graphene

2012-05-07 , Johnson, Christine

In this study we investigate the effects of intercalation of graphene with Iron III Chloride on the optical and electronic properties of the multilayer graphene. While both the optical properties and the electronic properties of graphene have been previously examined, a viable method of preserving the optical properties while enhancing the electrical properties has not yet been developed. Research has been conducted into the effects of other chemical dopants such as HNO3, but the demonstrated results do not yet provide the high transparency and low sheet resistance required in a TCE. The results from our studies suggest that the decrease in the absorption of the optical wavelengths is a result of the p-doping of the graphene that excludes low energy direct optical transitions. Optical absorption is shown to be both a function of thickness and intercalation staging, as are the electrical properties. The results indicate that intercalating graphene with Iron III Chloride may be a viable method to improve the electronic characteristics of graphene without losing the desired optical properties.

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Nematic Order in Spherical Geometries

2010-05-11 , Devaiah, Sharan

Nematic Liquid crystals (NLC) are rod like molecules that in the absence of external influences arrange themselves parallel to each other and hence tend to point in a given direction. The average orientation of these molecules is given by the director n, which is essentially a bi-directional vector which quantifies the orientation of the molecules in a given region of the sample. When NLCs are confined to a curved surface, the geometrical constraints imposed by the surface causes a distortion in the molecular orientation. In certain regions, the molecular orientation is such that the director cannot be defined. Such regions are called topological defects. Theory had predicted that the ground state of NLCs confined to a spherical surface has four defects located at the vertices of a tetrahedron. The tetrahedral defect structure is of great interest in material science because defects in NLCs are regions that can be functionalized to serve as bonds that could pave the way for making macroatoms with tetrahedral bonding properties similar to sp3 hybridized atoms like Carbon. By using ultrathin shells of NLCs, we show that the tetrahedral structure is indeed what we observe experimentally, verifying the theory for the first time. However, this tetrahedral structure coexists with other structures consisting of two or three defects. We also study these defect structures.

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Determining the minimal covering set of parameter spaces for phenomenological gravitational waveforms

2011-05-09 , Burns,  Dustin

Gravitational wave observatories are now trying to detect gravitational waves, ripples in space time predicted by Einstein’s theory of General Relativity, from sources such as merging binary star and black hole systems. Numerical relativists create template banks of gravitational waves from merging black hole binaries in an effort to confirm a gravitational wave detection by solving Einstein’s field equations. These waveforms are then compared to the raw data collected by gravitational wave detectors. Since it is computationally expensive to produce the full numerical relativity waveforms, theorists have created approximation techniques called phenomenological waveforms, in which analytical functions approximate the numerical solutions over a finite space of parameters. It is computationally expensive to match the waveform template banks to the data from the observatories. In an effort to minimize the number of waveforms in the template banks, I determine the minimal covering set of the parameter space for non-spinning binary black hole phenomenological waveforms. This is accomplished by marching through a very fine mesh of the parameter space, ensuring that the match between adjacent waveforms is above a given threshold. I determine this minimal covering set for the non-spinning case and discuss how to generalize the program to the full spinning case.

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