Browsing Physics and Astronomy by Title
Now showing items 574-593 of 767
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Security proof methods for quantum key distribution protocols
(University of Waterloo, 2013-04-26)In this thesis we develop practical tools for quantum key distribution (QKD) security proofs. We apply the tools to provide security proofs for several protocols, ranging from discrete variable protocols in high dimensions, ... -
Security Proofs for Quantum Key Distribution Protocols by Numerical Approaches
(University of Waterloo, 2017-10-25)This thesis applies numerical methods to analyze the security of quantum key distribution (QKD) protocols. The main theoretical problem in QKD security proofs is to calculate the secret key generation rate. Under certain ... -
Segregation of chain ends to the surface of a polymer melt: effect of surface profile versus chain discreteness
(Springer, 2016)Silberberg has argued that the surface of a polymer melt behaves like a reflecting boundary on the random-walk statistics of the polymers. Although this is approximately true, independent studies have shown that violations ... -
Selected Experiments with Proteins at Solid-Liquid Interfaces
(University of Waterloo, 2008-12-12)This thesis describes a number of novel experiments contributing to the understanding of protein adsorption from both a fundamental and applied perspective. The first three papers involve the use of the localized surface ... -
Selected topics in Computational Relativity
(University of Waterloo, 2022-08-18)This thesis addresses a collection of topics that are either directly related to, or have implications for, current challenges in computational relativity. In the first part, we explore a spacetime discretization method ... -
Self-assembly of a binary mixture of particles and diblock copolymers
(Royal Society of Chemistry, 2003)Using theoretical models, we undertake the first investigation into the synergy and rich phase behavior that emerges when binary particle mixtures are blended with microphase- separating copolymers. We isolate an example ... -
Self-Assembly of Amphiphilic Nanoparticle-Coil “Tadpole” Macromolecules
(American Chemical Society, 2004)None. -
Self-Assembly of Amphiphilic Nanoparticle-Coil “Tadpole” Macromolecules
(American Chemical Society, 2004)There has been considerable fascination with the self-assembling behavior of amphiphilic chainlike molecules that range from short-chain surfactants to high molecular weight block copolymers. The self-assembly of simple ... -
The Self-Assembly of Particles with Isotropic Interactions
(University of Waterloo, 2012-09-26)In recent years there has been much interest in the self-assembly of materials. Much of this research has been focused on the self-assembly of particles in solution (colloids), typically on the order of nanometres or ... -
The Self-Assembly of Particles with Isotropic Interactions
(IOP publishing, 2013-07-03)A generic field-theoretic model for the self-assembly of particles with isotropic interactions, motivated by ideas in DNA-mediated colloidal assembly, is presented. A simplest possible system of colloids in explicit ... -
The self-assembly of particles with isotropic interactions: Using DNA coated colloids to create designer nanomaterials
(AIP publishing, 2014-04-03)Self-consistent field theory equations are presented that are suitable for use as a coarse-grained model for DNA coated colloids, polymer-grafted nanoparticles and other systems with approximately isotropic interactions. ... -
Semi-Analytic Radiatively Inefficient Accretion Flows in General Gravity
(University of Waterloo, 2018-01-05)The Event Horizon Telescope is capable of observing black holes on event-horizon scales and we can use it to explore deviations from General Relativity. We replicate the results of a previous study using a Newtonian ... -
Sensing the shape of spacetime: detector response and entanglement harvesting in curved space
(University of Waterloo, 2019-01-24)This thesis seeks to understand what information Unruh-DeWitt detectors can gain about the structure of spacetime. By coupling to the quantum state of a field on a curved space, the detectors can gain information about ... -
A sensitive search for dark energy through chameleon scalar fields using neutron interferometry
(IOP Publishing, 2015-01-22)The physical origin of the dark energy, which is postulated to cause the accelerated expansion rate of the universe, is one of the major open questions of cosmology. A large subset of theories postulate the existence of a ... -
Setup and Design of a Cryogenic Testing Station with Focus on Characterization of Superconducting Devices
(University of Waterloo, 2019-05-23)The goal of my thesis was to construct a general purpose cryostat, capable of measuring multiple devices at 100mK. This included modifying an existing SHASTA model 106 Adiabatic Demagnetization Refrigerator (ADR) by adding ... -
Setup of Dry Cryostat for Measurements on Superconducting Microwave Resonators
(University of Waterloo, 2019-09-20)A cryogen-free cryostat was set up in order to perform measurements at ultra low temperatures. The setup involved the removal of an adiabatic demagnetization refrigerator (ADR) and replacing it with a dilution refrigerator ... -
Shape dynamics and Mach's principles: Gravity from conformal geometrodynamics
(University of Waterloo, 2011-08-26)We develop a new approach to classical gravity starting from Mach's principles and the idea that the local shape of spatial configurations is fundamental. This new theory, shape dynamics, is equivalent to general relativity ... -
The Shape of Dark Matter Haloes: Results from Weak Lensing
(University of Waterloo, 2020-09-25)Dark matter haloes are expected to have a triaxial shape, appearing elliptical in projection. Understanding the orientation of these dark matter haloes, and how they are aligned, has implications for theories of structure ... -
Signatures of New Physics from the Primordial Universe
(University of Waterloo, 2007-08-29)During inflation quantum fluctuations of the field driving inflation, known as inflaton, were stretched by inflationary expansion to galactic size scales or even larger. A possible implication of inflation -- if it is ... -
Silicon avalanche photodiodes for satellite based quantum communication
(University of Waterloo, 2018-09-25)Single photons detectors are required for applications like quantum key distribution and testing Bell's inequalities. Silicon avalanche photodiodes (Si APD's) have advantages like low dark count rate. This thesis aims to ...