Browsing Physics and Astronomy by Title
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Quantum Algorithmic Techniques for FaultTolerant Quantum Computers
(University of Waterloo, 20191001)Quantum computers have the potential to push the limits of computation in areas such as quantum chemistry, cryptography, optimization, and machine learning. Even though many quantum algorithms show asymptotic improvement ... 
The quantum and the gravity: Newtonian and Cosmological applications
(University of Waterloo, 20180718)The gravitational decoherence field studies the suppression of coherence in quantum systems caused by effects rooted in the gravitational interaction. This models are not just important to yield interesting ideas about the ... 
Quantum Black Holes in the Sky
(University of Waterloo, 20200930)Black Holes are possibly the most enigmatic objects in our Universe. From their detection in gravitational waves upon their mergers, to their snapshot eating at the centres of galaxies, black hole astrophysics has undergone ... 
Quantum correlations in a noisy neutron interferometer
(American Physical Society, 20140915)We investigate quantum coherences in the presence of noise by entangling the spin and path degrees of freedom of the output neutron beam from a noisy threeblade perfect crystal neutron interferometer. We find that in the ... 
Quantum critical responses via holographic models and conformal perturbation theory
(University of Waterloo, 20170615)We investigate response functions near quantum critical points, allowing for finite temperature and a mild deformation by a relevant scalar. When the quantum critical point is described by a conformal field theory, we use ... 
Quantum dot devices in silicon and dopantfree GaAs/AlGaAs heterostructures
(University of Waterloo, 20210129)Single spin quantum dot qubits in silicon are a promising candidate for a scalable quantum processor due to their long coherence times, compact size, and ease of integration into existing fabrication technologies. Realizing ... 
Quantum Gates and Decoupling in Qubits with Fixed Transverse Coupling
(University of Waterloo, 20170525)Among all the quantum computer candidates, the superconducting system is one of the most convincing platforms due to its strong couplings and scalability. To be more specific, this thesis focuses on the superconducting ... 
Quantum Gravity Renormalization Group
(University of Waterloo, 20200727)Investigations relating the emergence of the radial direction in the holography, solvable irrelevant deformations of conformal eld theories and holographic entanglement entropy are reported. Emphasis is laid on how ... 
Quantum groundstates of the spin1/2 XXZ model on a fullyfrustrated honeycomb lattice
(University of Waterloo, 20101001)In this thesis we present results from quantum Monte Carlo for the fullyfrustrated honeycomb lattice. The XXZ model is of interest in the classical limit, as there is a mapping between the classical fullyfrustrated ... 
Quantum Information Enabled Neutron Interferometry
(University of Waterloo, 20170612)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, 20160830)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, 20090903)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 pregeometry models for Quantum Gravity
(University of Waterloo, 20120823)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 quenches and the holographic duality.
(University of Waterloo, 20150108)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 tests of causal structures and nonorthogonal states
(University of Waterloo, 20140613)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 ... 
QuantumClassical Correspondence and Entanglement in Periodically Driven Spin Systems
(University of Waterloo, 20190809)This dissertation sets out to examine some fundamental open questions in quantum physics regarding quantumclassical correspondence in regular versus chaotic systems. Specifically, we study these questions using approaches ... 
Quantuminformation approach to dynamical diffraction theory
(American Physical Society, 20161208)We present a simplified model for dynamical diffraction of particles through a periodic thick perfect crystal based on repeated application of a coherent beamsplitting unitary at coarsegrained 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, 20110830)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, 20181024)Rogue waves are rare events with unusually large wave amplitudes. In this thesis the multicanonical procedure is applied to the onedimensional nonlinear Schrödinger equation in conjunction with a high order finite difference ...