Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"surface electrode"”.
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Microfabrication of surface electrode ion traps for quantum manipulation
… detailed microfabrication of several series of surface electrode linear Paul traps made from different electrode materials, followed by the ion motional heating experiment results for these traps. We demonstrate that the ion motional heating strongly depends on fabrication process. In …
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A surface electrode array-based system for functional electrical stimulation
The goal of this thesis is to develop an electrode array-based functional electrical stimulation (FES) system for foot drop correction. The thesis reports a series of studies on the design and development of an electrode array, describes how these results informed the design of a practical array …
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Design of superconducting transmission line integrated surface-electrode ion-traps
We fabricated superconducting surface electrode ion traps with integrated microwave coplanar waveguides using direct-write optical lithography and a niobium on sapphire process. We then tested these traps in a closed cycle cryostat and used 28 mW of microwave power to excite rotational transitions …
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Sensitive, 3D micromotion compensation in a surface-electrode ion trap
… move towards microfabricated traps with all the electrodes on a single chip. These traps, known as surface-electrode ion traps, are more amenable to being shrunk in size and replicated, or integrated with optical components and electronic devices. However, in the shift towards surface-electrode …
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Cryogenic surface electrode ion traps with integrated superconducting microwave resonators for polar molecular ion spectroscopy
… with SrCl+ molecular ions in a cryogenic surface electrode RF ion trap and on using the coupling of the molecular ion's rotational states to an integrated superconducting microwave line or cavity either as a cooling method or for precise rotational spectroscopy. The first part of the …
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Study of low energy Ytterbium atom-ion charge transfer collisions using a surface-electrode trap
… by spatially overlapping the 172yb+ ions in the surface-electrode trap and 174Yb atoms in the magneto-optical trap, and measuring ion loss. We confirm that, in the Langevin regime, the charge transfer collisional rate is independent of the collisional energy. The measured Langevin cross section …
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Measurements of electric field noise and light-induced charging in cryogenic surface electrode ion traps
… in the electric field due to noise and electrode charging must be reduced to increase coherence of the motional quantum state. Gold has been a popular choice in the past due to its inert properties; however, it is undesirable due its incompatibility with CMOS technology. This has led to …
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Quantum gates, sensors, and systems with trapped ions
… requires miniaturizing ion traps by using a surface-electrode geometry. Using a single ion in a surface-electrode trap, we perform a two-qubit entangling gate and fully characterize it via quantum process tomography, as an initial validation of surface-electrode ion traps for quantum …
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High fidelity quantum gates with ions in cryogenic microfabricated ion traps
… motional state decoherence at sub-100 [mu]m ion-electrode distances. This thesis explores the source and suppression of this decoherence at cryogenic temperatures, and demonstrates fundamental logic gates in a surface electrode ion trap. Construction of the apparatus requires the development of a …
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Compensating sequences for robust quantum control of trapped-ion qubits
… ions. One solution is to employ microfabricated surface-electrode traps, which are well-suited for scalable designs and integrated systems. We describe two novel surface-electrode traps, one with on-chip microwave waveguides for hyperfine 171Yb+ qubit manipulations, and a second trap with an …
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Integrated chips and optical cavities for trapped ion quantum information processing
… are based on a new ion trap geometry, called the surface-electrode trap, in which all of the electrodes reside in a single plane. Three generations of surface-electrode traps are designed, fabricated, and tested - culminating with the demonstration of an ion trap chip microfabricated using …
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Effects of Surface Ion Milling on Ion Trap Heating
Ions trapped above a surface electrode chip are a viable candidate for a scalable qubit architecture. The internal electronic state of the ions serve as qubits, while the shared motional modes of ions in a lattice serve as a quantum bus by which information can be shared. Gate operations are …
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Modellierung des dynamischen Verhaltens von Oberflächen-Barrierenentladungen und der Ozonerzeugung
Surface discharges, as a special kind of barrier discharges, occur in arrangements with small but extended high-voltage electrodes on one side of a dielectric layer and a plane counter electrode on its reverse side. Surface discharges are used e. g. in excimer lamps, in plasmadisplays, for surface …
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Measuring trapped-ion motional decoherence through direct manipulation of motional coherent states
… ion trapped 50 micrometers above a niobium surface electrode trap in an ultra-high vacuum chamber at 4 Kelvin, we measure a motional decoherence rate of (24 ± 5) s⁻¹. This measured rate matches the expected decoherence rate for a system where trapped ion heating dominates other forms of …
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An investigation of precision and scaling issues in nuclear spin and trapped-ion quantum simulators
… novel ion trap designs, a lattice ion trap and a surface-electrode elliptical ion trap. We experimentally confirm a theoretical model of each trap, and evaluate the suitability of each design for quantum simulation. We find that the relevant interaction rates are much higher in the elliptical …
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A Comparison of ICA versus genetic algorithm optimized ICA for use in non-invasive muscle tissue EMG
… combination of specially positioned monopolar surface Electromyography (sEMG) electrodes and a Blind Source Separation algorithm. This concept was then proved by Morowasi and John [2] in a 12 electrode prototype system around the bicep. This proof of concept showed that it was possible to …
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Optimizing Ion-Shuttling Operations in Trapped-Ion Quantum Computers
… robust transport of 40Ca on our custom-designed surface electrode trap and share spectroscopy data taken during the first ever attempt at optimal splitting. I then outline the necessary steps to achieve fast splitting with less than 1 quanta of excitation. It is my hope that the theories, …
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Microfluidic cancer cell isolation system using magnetic nanoparticle hybrids and advanced interdigitated electrode technology
… 1 through photolithography, and characterizing surface smoothness and height variation, through atomic force microscopy, and confirming size specifications and detecting electrode rigidity, through scanning electron microscopy. The project is currently being patented due to the uniqueness of the …
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IN SITU PLASMA REMOVAL OF SURFACE CONTAMINANTS FROM ION TRAP ELECTRODES
… an in situ plasma discharge designed to remove surface contaminants from electrodes in an ion trapping experimental system is presented with results. In recent years, many advances have been made in using ion traps for quantum information processing. All of the criteria defined by DiVincenzo for …
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Modeling and characterization of ionic polymer transducers for sensing and actuation
… polymer materials. When plated with a conductive surface electrode, these ionomeric membranes function effectively as either sensors or actuators. Mechanically compliant, these transducers demonstrate large strain, but limited force, capabilites while operating at low excitation voltages. The …
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