Now showing items 11720-11739 of 15492

    • Quantum Information Processing with Adversarial Devices 

      McKague, Matthew (University of Waterloo, 2010-06-09)
      We consider several applications in black-box quantum computation in which untrusted physical quantum devices are connected together to produce an experiment. By examining the outcome statistics of such an experiment, and ...
    • Quantum Key Distribution Data Post-Processing with Limited Resources: Towards Satellite-Based Quantum Communication 

      Gigov, Nikolay (University of Waterloo, 2013-01-23)
      Quantum key distribution (QKD), a novel cryptographic technique for secure distribution of secret keys between two parties, is the first successful quantum technology to emerge from quantum information science. The security ...
    • Quantum key distribution devices: How to make them and how to break them 

      Kaiser, Sarah (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 Machine Learning for Recognizing Gaussian Discord 

      Wang, Luyao (University of Waterloo, 2022-01-25)
      The quantum correlations measured by quantum discord have been paying significant attention since they are an essential resource for quantum information. This thesis focuses on the quantum discord in continuous-variable ...
    • Quantum mechanical free energy calculations using path integral molecular dynamics 

      Bishop, Kevin (University of Waterloo, 2019-12-19)
      Free energy calculations are one of the most powerful tools within modern theoretical chemistry and are often used to make comparisons with experimental results. Existing free energy calculations are typically performed ...
    • Quantum Methodologies for the simulation of molecular hydrogen: from dimers to linear chains 

      Marr, Adam (University of Waterloo, 2020-12-03)
      Hydrogen has long been considered an ideal model system for a variety of molecular configurations, given its chemical simplicity and ubiquitous nature in the world. However, the weak van der Waals forces that exist between ...
    • Quantum Microwave Photodetection Using Superconducting Josephson Circuits. 

      Osberg, Brendan (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 Optoelectronic Detection and Mixing in the Nanowire Superconducting Structure 

      Yan, Zhizhong (University of Waterloo, 2010-01-20)
      The recent advancement of superconducting nano devices has allowed for making a Superconducting Nanowire Single Photon Detector (SNSPD), whose extraordinary features have strongly motivated the research community to exploit ...
    • Quantum pre-geometry models for Quantum Gravity 

      Francesco, Caravelli (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 

      Cong, Wan (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. 

      van Niekerk, Anton (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 Random Access Codes with Shared Randomness 

      Ozols, Maris (University of Waterloo, 2009-05-22)
      We consider a communication method, where the sender encodes n classical bits into 1 qubit and sends it to the receiver who performs a certain measurement depending on which of the initial bits must be recovered. This ...
    • Quantum Ray Marching: Reformulating Light Transport for Quantum Computers 

      Mosier, Logan (University of Waterloo, 2023-11-27)
      The use of quantum computers in computer graphics has gained some interest in recent years, especially for the application of rendering. The current state of the art in quantum rendering relies on Grover's search for finding ...
    • Quantum Reference Frames and The Poincaré Symmetry 

      Kabernik, Oleg (University of Waterloo, 2014-09-19)
      The concept of a reference frame has been a part of the physical formalism since the early days of physics. The reference frame was always understood as a physical system with respect to which states of other physical ...
    • Quantum Rejection Sampling 

      Shayeghi, Ala (University of Waterloo, 2015-01-21)
      Let H be a finite dimensional Hilbert space and ρ, σ ∈ D(H) be quantum states in H such that S(ρ||σ) is finite. In this thesis, we consider the following communication task involving two parties Alice and Bob. Suppose ...
    • Quantum Snake Walk on Graphs 

      Rosmanis, Ansis (University of Waterloo, 2010-01-13)
      Quantum walks on graphs have been proven to be a useful tool in quantum algorithm construction for various problems. In this thesis we introduce a new type of continuous-time quantum walk on graphs called the quantum snake ...
    • Quantum Speed-ups for Boolean Satisfiability and Derivative-Free Optimization 

      Arunachalam, Srinivasan (University of Waterloo, 2014-04-21)
      In this thesis, we have considered two important problems, Boolean satisfiability (SAT) and derivative free optimization in the context of large scale quantum computers. In the first part, we survey well known classical ...
    • Quantum State Local Distinguishability via Convex Optimization 

      Cosentino, Alessandro (University of Waterloo, 2015-08-24)
      Entanglement and nonlocality play a fundamental role in quantum computing. To understand the interplay between these phenomena, researchers have considered the model of local operations and classical communication, or LOCC ...
    • Quantum state purification 

      Fu, Honghao (University of Waterloo, 2016-08-29)
      Quantum state purification is a process in which decoherence is partially reversed by using multiple copies of the input states that have been subject to the same decoherence effect. This thesis focuses on purifying the ...
    • Quantum State Transfer in Graphs 

      Coutinho, Gabriel (University of Waterloo, 2014-08-13)
      Let X be a graph, A its adjacency matrix, and t a non-negative real number. The matrix exp(i t A) determines the evolution in time of a certain quantum system defined on the graph. It represents a continuous-time quantum ...

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