Browsing Physics and Astronomy by Title
Now showing items 525-544 of 768
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Quantum groundstates of the spin-1/2 XXZ model on a fully-frustrated honeycomb lattice
(University of Waterloo, 2010-10-01)In this thesis we present results from quantum Monte Carlo for the fully-frustrated honeycomb lattice. The XXZ model is of interest in the classical limit, as there is a mapping between the classical fully-frustrated ... -
Quantum Information across Spacetime: From Gravitational Waves to Spinning Black Holes
(University of Waterloo, 2021-08-20)This thesis is split into two parts. In the first part, we investigate Bose-Einstein condensates (BECs) as a means to detect gravitational waves. For the detection of continuous gravitational waves, we study its sensitivity ... -
Quantum Information Enabled Neutron Interferometry
(University of Waterloo, 2017-06-12)Neutron interferometry with its ability to encode and extract information provides a test bed for quantum mechanics and precise measurement of physical quantities of significant importance in physics. However, this ... -
Quantum key distribution devices: How to make them and how to break them
(University of Waterloo, 2016-08-30)As more aspects of modern society depend on digital communication, we increasingly rely on infrastructure that ensures the privacy and security of this communication. Classically, this has been provided by cryptographic ... -
Quantum Microwave Photodetection Using Superconducting Josephson Circuits.
(University of Waterloo, 2009-09-03)Superconducting circuits have recently become a major contender for the implementation of quantum computers owing to their compatibility with existing microchip fabrication technologies. Their utility stems largely from ... -
Quantum pre-geometry models for Quantum Gravity
(University of Waterloo, 2012-08-23)In this thesis we review the status of an approach to Quantum Gravity through lattice toy models, Quantum Graphity. In particular, we describe the two toy models introduced in the literature and describe with a certain ... -
Quantum Probings of Curved Spacetimes
(University of Waterloo, 2021-08-10)This thesis is divided into two parts. The first part studies the response of Unruh DeWitt detectors in different spacetimes. One of the main goals here is to demonstrate that Unruh DeWitt detectors can detect spacetime ... -
Quantum quenches and the holographic duality.
(University of Waterloo, 2015-01-08)We study quantum quenches in a strongly coupled conformal field theory, using the gauge/gravity duality. In the first part of the thesis, we consider a perturbative thermal quench of a field theory in four spacetime ... -
Quantum reference frames associated with non-compact groups: the case of translations and boosts, and the role of mass
(American Physical Society, 2016-03)Quantum communication without a shared reference frame or the construction of a relational quantum theory requires the notion of a quantum reference frame. We analyze aspects of quantum reference frames associated with ... -
Quantum tests of causal structures and non-orthogonal states
(University of Waterloo, 2014-06-13)This thesis details two experimental tests that can be applied to particular quantum states to reveal important information. We begin by discussing the relevant background in quantum information. We introduce qubits and ... -
Quantum-Classical Correspondence and Entanglement in Periodically Driven Spin Systems
(University of Waterloo, 2019-08-09)This dissertation sets out to examine some fundamental open questions in quantum physics regarding quantum-classical correspondence in regular versus chaotic systems. Specifically, we study these questions using approaches ... -
Quantum-information approach to dynamical diffraction theory
(American Physical Society, 2016-12-08)We present a simplified model for dynamical diffraction of particles through a periodic thick perfect crystal based on repeated application of a coherent beam-splitting unitary at coarse-grained lattice sites. By demanding ... -
A Quasilocal Hamiltonian for Gravity with Classical and Quantum Applications
(University of Waterloo, 2000)I modify the quasilocal energy formalism of Brown and York into a purely Hamiltonian form. As part of the reformulation, I remove their restriction that the time evolution of the boundary of the spacetime be orthogonal ... -
Quaternions and Quantum Theory
(University of Waterloo, 2011-08-30)The orthodox formulation of quantum theory invokes the mathematical apparatus of complex Hilbert space. In this thesis, we consider a quaternionic quantum formalism for the description of quantum states, quantum channels, ... -
Rare Events Prediction: Rogue Waves and Drags
(University of Waterloo, 2018-10-24)Rogue waves are rare events with unusually large wave amplitudes. In this thesis the multicanonical procedure is applied to the one-dimensional nonlinear Schrödinger equation in conjunction with a high order finite difference ... -
Re-visiting the Radio-Mechanical Feedback in Brightest Cluster Galaxies
(University of Waterloo, 2023-01-23)The self-regulated feedback from the Active Galactic Nucleus (AGN) plays a key role in the formation and evolution of galaxies by heating and expelling gas in galaxies. The goal of this thesis is to investigate the role ... -
REAL-TIME OBSERVATION OF MOLECULAR REACTION MECHANISM OF HALOPYRIMIDINES AS RADIO-/PHOTOSENSITIZING DRUGS USING TIME-RESOLVED FEMTOSECOND LASER SPECTROSCOPY
(University of Waterloo, 2007-05-22)Replacement of thymidine in DNA by halopyrimidines, such as bromodeoxyuridine (BrdU) and iododeoxyuridine (IdU), has long been known to enhance DNA damage and cell death induced by ionizing/UV radiation, but the mechanism ... -
Realisation of Quantum Operations using Linear Optics
(University of Waterloo, 2011-10-04)The main topic of this thesis is linear optics and the implementation of quantum operations (measurements, quantum channels, and unitary rotations) on optical systems. In the opening chapter the basic notions needed to ... -
Realization of novel entangled photon sources using periodically poled materials
(University of Waterloo, 2010-10-01)This thesis deals with the production of entangled photons using spontaneous parametric down-conversion (SPDC). We start with a short overview of some important theoretical concepts. First we provide a brief reminder of ... -
Reconstructing Cosmic Velocities with the Kinetic Sunyaev-Zeldovich Effect
(University of Waterloo, 2021-09-13)Over the last few decades, Physical Cosmology has come a long way from a primitive and data-deprived field of research with several speculative theories of origin, evolution, and composition of the Universe to a mature, ...