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 15 of 15 for “"Geometric Phase"”.
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Defects, topology, and the geometric phase in condensed matter physics
… in condensed matter physics, particularly geometric phases and defects. The first chapter deals with pentagonal disclinations in graphene and their associated bound states. This problem had been attacked previously, using index theorems, as well as the solutions of the continuum Dirac …
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Bridging the Geometric and Quantum Information of Structured Light
… have developed for preparing and measuring the geometric and quantum information of structured light. The geometric phase acts as a memory of transformations undertaken by physical processes; quantum entanglement underpins quantum information science which explores the theoretical and …
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Dynamic and geometric control of electronic spins in diamond for quantum sensing and quantum information science
… I present novel schemes to dynamically and geometrically control NV spins for improved magnetic field sensing and studies of spin dynamics. First, dynamic NV phase control is synchronized with an external oscillating magnetic field, enabling single and ensemble NV AC magnetometry spectral …
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Low-dimensional carbon allotropes: an electron microscopy investigation
… methods, like electron holography and Geometric Phase Analysis (GPA), using a low-voltage optical set-up, to reduce radiation damage in the samples. Electron holography was used to successfully measure the mean electrostatic potential of an isolated SWCNT and that of a mono-atomically …
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STUDIES IN QUANTUM CONTROL AND QUANTUM INFORMATION
… this by pulse-engineering the signal onto a geometric phase, which is then encoded into qubits via spin-spin interaction. In the second project, we propose a quantum circuit implementation of the Petz recovery map for single-qubit decoherence, analyzing its resource requirements, performance …
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Chiral Rings of Two-dimensional Field Theories with (0,2) Supersymmetry
… the nonabelian gauged linear sigma model whose geometric phase is associated with the Grassmannian. Combined with the classical result, the quantum ring structure is derived from the one-loop effective potential. Supersymmetric localization is also applicable in this case, which proves to be …
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Studies on the effect of noise in boundary quantum phase transitions
<p>Boundary quantum phase transitions are abrupt ground state transitions triggered by the change of the boundary conditions at single or multiple (but finite) points.</p><p>When boundary effects dominate, understanding boundary quantum phase transitions requires a deeper knowledge of strongly …
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One- and two-photon states for quantum information
… states, we make the first optical mixed-state geometric phase measurement via single-photon interferometry. Finally, we present experimental progress on the remote preparation of single-photon number states, created deterministically out of a non-deterministic spontaneous parametric …
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Development of next-generation near-eye and naked-eye optical display systems
… combiner for see-through near-eye display using geometric phase lenses (GPL) and an ultrashort throw laser MEMS projector. These systems show improved compactness, outstanding adaptation and high image quality, making them proper candidates of the next-generation near-eye and naked-eye optical …
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Many-body entanglement : topological orders, tensor networks and superconductivity
… could be achieved by calculating the non-Abelian geometric phase (S, T)-matrices from the fixed-point wave functions, obtained in the string-net approach by Levin and Wen and the local unitary transformation approach by Chen, Gu and Wen. In doing so, (S, T)-matrices act as our non-local "order …
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Ultracold Molecules: The Effect of Electromagnetic Fields
… in the mean-field approximation, the resultant geometric phase effect induces stable states of persistent superfluid flow that are characterized by half-integer quantized angular momentum.
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Precision magnetometry and imaging via quantum manipulation of spins in diamond
… for the first time multiple-NV control using phase encoding. Pulsed magnetic field gradients encode in the NV spin phase the information about the position of the NV centers as well as the external magnetic field in the Fourier-space. This scheme allows 100-fold improvement in spatial …
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Nanoscale quantification of stress and strain in III-V semiconducting nanostructures
… diffraction, nanobeam electron diffraction, and geometric phase analysis we quantify and map the strain fields in top-down fabricated InAlN/GaN high electron mobility transistor structures and GaAs/GaAsP core-shell nanowires grown by a particle-mediated vapor-liquid-solid mechanism. By comparing …
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Quantum Information Processing with Color Center Qubits: Theory of Initialization and Robust Control
Quantum information technologies include secure quantum communications and ultra precise quantum sensing that are significantly more efficient than their classical counterparts. To enable such technologies, we need a scalable quantum platform in which qubits are con trollable. Color centers provide …