Browsing Theses by Subject "quantum computing"
Now showing items 21-40 of 50
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Measuring Trapped Ion Qudits
(University of Waterloo, 2019-09-26)Quantum information has typically focused on using 2-level qubits to perform simulation and computation. We propose to expand the number of levels for computation using qudits, where \(d>2\). Doing so could be a viable ... -
Modeling and managing noise in quantum error correction
(University of Waterloo, 2023-10-19)Simulating a quantum system to full accuracy is very costly and often impossible as we do not know the exact dynamics of a given system. In particular, the dynamics of measurement noise are not well understood. For this ... -
Modeling Classical Dynamics and Quantum Effects in Superconducting Circuit Systems
(University of Waterloo, 2015-08-20)In recent years, superconducting circuits have come to the forefront of certain areas of physics. They have shown to be particularly useful in research related to quantum computing and information, as well as fundamental ... -
Negative Quasi-Probability in the Context of Quantum Computation
(University of Waterloo, 2013-08-09)This thesis deals with the question of what resources are necessary and sufficient for quantum computational speedup. In particular, we study what resources are required to promote fault tolerant stabilizer computation to ... -
New methods for Quantum Compiling
(University of Waterloo, 2014-04-30)The efficiency of compiling high-level quantum algorithms into instruction sets native to quantum computers defines the moment in the future when we will be able to solve interesting and important problems on quantum ... -
On Free Space Quantum Key Distribution and its Implementation with a Polarization-Entangled Parametric Down Conversion Source
(University of Waterloo, 2007-05-16)This thesis describes the deployment of a free-space quantum key distribution system across the University of Waterloo campus. The quantum key distribution system has the ability to provide unconditionally secure ... -
On the Evolutionary Design of Quantum Circuits
(University of Waterloo, 2005)The goal of this work is to understand the application of the evolutionary programming approach to the problem of quantum circuit design. This problem is motivated by the following observations: <ul> <li>In order to ... -
On the Hardness of the Quantum Separability Problem and the Global Power of Locally Invariant Unitary Operations
(University of Waterloo, 2008-09-18)Given a bipartite density matrix ρ of a quantum state, the Quantum Separability problem (QUSEP) asks — is ρ entangled, or separable? In this thesis, we first strengthen Gurvits’ 2003 NP-hardness result for QUSEP by showing ... -
On the power of interleaved low-depth quantum and classical circuits
(University of Waterloo, 2022-09-26)Low-depth quantum circuits are a well-suited model for near-term quantum devices, given short coherence times and noisy gate operations, making it pivotal to examine their computational power. It was already known as early ... -
An Optimizing Pulse Sequence Compiler for NMR QIP
(University of Waterloo, 2003)Quantum information processing is a multi-disciplinary science involving physics, mathematics, computer science, and even quantum chemistry. It is centred around the idea of manipulating physical systems at the quantum ... -
Quantum Algorithmic Techniques for Fault-Tolerant Quantum Computers
(University of Waterloo, 2019-10-01)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 ... -
Quantum Compression and Quantum Learning via Information Theory
(University of Waterloo, 2020-12-21)This thesis consists of two parts: quantum compression and quantum learning theory. A common theme between these problems is that we study them through the lens of information theory. We first study the task of visible ... -
Quantum dot devices in silicon and dopant-free GaAs/AlGaAs heterostructures
(University of Waterloo, 2021-01-29)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 Strategies and Local Operations
(University of Waterloo, 2010-01-06)This thesis is divided into two parts. In Part I we introduce a new formalism for quantum strategies, which specify the actions of one party in any multi-party interaction involving the exchange of multiple quantum messages ... -
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 ... -
Resource optimization for fault-tolerant quantum computing
(University of Waterloo, 2014-01-02)Quantum computing offers the potential for efficiently solving otherwise classically difficult problems, with applications in material and drug design, cryptography, theoretical physics, number theory and more. However, ... -
Some Results on Qudit Quantum Error-Correction
(University of Waterloo, 2020-01-30)Quantum computing’s seemingly perpetual promise of nearness still has a few hurdles to surmount before it can become a reality. Among these hurdles is that of protection of information from random errors. A potential ... -
Suppression and characterization of decoherence in practical quantum information processing devices
(University of Waterloo, 2008-08-01)This dissertation addresses the issue of noise in quantum information processing devices. It is common knowledge that quantum states are particularly fragile to the effects of noise. In order to perform scalable quantum ... -
Theory of measurement-based quantum computing
(University of Waterloo, 2008-12-10)In the study of quantum computation, data is represented in terms of linear operators which form a generalized model of probability, and computations are most commonly described as products of unitary transformations, which ... -
Towards Dual-Isotope Entangling Gates for Trapped-Ion Quantum Computing
(University of Waterloo, 2022-09-14)Entangling gates are essential to the development in the capabilities of any trapped-ion quantum computer. High-fidelity entangling gates have previously been demonstrated on trapped-ion quantum hardware with single species ...