Browsing Physics and Astronomy by Type "Doctoral Thesis"
Now showing items 2140 of 263

Charge Density Wave Order in Cuprate Superconductors Studied by Resonant Soft Xray Scattering
(University of Waterloo, 20150422)Cuprate high temperature superconductors have been the subject of intense investigation since their discovery in 1986. The nature of the pairing mechanism in these unconventional superconductors does not seem to be mediated ... 
Circuit Complexity of Mixed States
(University of Waterloo, 20210720)Quantum information has produced fresh insights into foundational questions about the AdS/CFT correspondence. One fascinating concept, which has captured increasing attention, is quantum circuit complexity. As a natural ... 
Classical simulations of quantum systems using stabilizer decompositions
(University of Waterloo, 20210219)One of the state of the art techniques for classically simulating quantum circuits relies on approximating the output state of the circuit by a superposition of stabilizer states. If the number of nonClifford gates in ... 
A Classification of (2+1)D Topological Phases with Symmetries
(University of Waterloo, 20170918)This thesis aims at concluding the classification results for topological phases with symmetry. First, we know that “trivial” (i.e., not topological) phases with symmetry can be classified by Landau symmetry breaking ... 
Classifications of Quantum Field Theories
(University of Waterloo, 20180704)We discuss classifications of UV complete supersymmetric theories in six dimensions, and (spin)topological field theories admitting a finite global symmetry and possibly timereversal symmetry in three dimensions. We also ... 
Coherent control of nuclear and electron spins for quantum information processing
(University of Waterloo, 20150810)The ability to perform quantum error correction (QEC) arbitrarily many cycles is a significant challenge for scalable quantum information processing (QIP). Key requirements for multipleround QEC are a high degree of quantum ... 
Collective Dynamics in NMR and Quantum Noise
(University of Waterloo, 20161017)We introduced an open quantum system model to describe the statistical fluctuations of a spin ensemble in NMR. The model considers an ensemble measurement where the detection coil does not distinguish spins, and accounts ... 
Complexity in the AdS/CFT correspondence
(University of Waterloo, 20190814)The main goal of this thesis is to carefully analyze aspects of the gravitational quantities conjectured to be dual to quantum complexity in the AdS/CFT correspondence. The two most promising candidates for such holographic ... 
Comprehensive Theoretical Studies of Guided Modes in Multilayer Hybrid Plasmonic Waveguides
(University of Waterloo, 20180502)Plasmonic waveguides (PWs) have integrated the strength of the miniscule size of electricalwire interconnects and the large operational bandwidth of photonic waveguides. Beyond the diffraction limit, PWs have the ability ... 
Computational Methods for the Measurement of Entanglement in Condensed Matter Systems
(University of Waterloo, 20140619)At the interface of quantum information and condensed matter physics, the study of entanglement in quantum manybody systems requires a new toolset which combines concepts from each. This thesis introduces a set of ... 
The computational power of manybody systems
(University of Waterloo, 20160928)Manybody systems are well known throughout physics to be hard problems to exactly solve, but much of this is folklore resulting from the lack of an analytic solution to these systems. This thesis attempts to classify the ... 
Concepts and methods for benchmarking quantum computers
(University of Waterloo, 20210709)Quantum computers have the potential to bring about a new age of technology, but in order for them to become a reality, the elephant in the room must be addressed, quantum errors. The complexity of quantum errors grows ... 
Conformation of 2fold Anisotropic Molecules Confined on a Spherical Surface
(University of Waterloo, 20120309)Anisotropic molecules confined on a spherical or other curved surface can display coupled positional and orientational orderings, which make possible applications in physics, chemistry, biology, and material science. ... 
Conical Designs and Categorical Jordan Algebraic PostQuantum Theories
(University of Waterloo, 20170106)Physical theories can be characterized in terms of their state spaces and their evolutive equations. The kinematical structure and the dynamical structure of finite dimensional quantum theory are, in light of the ... 
Constructing Exact Correlators In N=4 SYM Using Integrability
(University of Waterloo, 20190809)This thesis is devoted to the study of correlation functions in N = 4 superconformal Yang Mills theory. We focus on a class of four point functions for which we achieve formal results at finite coupling and explicit ... 
Contextuality and Ontological Models: A Tale of Desire and Disappointment
(University of Waterloo, 20190923)Since being defined by Kochen and Specker, and separately by Bell, contextuality has been proposed as one of the key phenomena that distinguishing quantum theory from classical theories. However, with the rise of quantum ... 
Continuous Tensor Networks, Conformal Field Theory and Holography
(University of Waterloo, 20200723)Tensor network methods are playing a central role in multiple disciplines of modern quantum physics, such as condensed matter physics, quantum information and quantum gravity. Based on renormalization group (RG) ideas, ... 
Control of LightMatter Interactions in Classical and Quantum Optics
(University of Waterloo, 20180112)In this thesis, we examined a series of techniques for controlling the interaction of light with matter that could be employed to optimize or to control physical phenomena in various potential applications. Some of these ... 
Control techniques in spin based quantum computation
(University of Waterloo, 20190711)Working on quantum systems entail different interests, for example, working on fundamental understanding of quantum systems also lay foundation for better quantum computation techniques. A test for whether a system is ... 
Controlling Quantum Information Devices
(University of Waterloo, 20120618)Quantum information and quantum computation are linked by a common mathematical and physical framework of quantum mechanics. The manipulation of the predicted dynamics and its optimization is known as quantum control. Many ...